**Graphing Quadratic Equation and Find the Nature of Roots :**

Here we are going to see some example problems of finding nature of solution of quadratic equation with graph.

To obtain the roots of the quadratic equation ax^{2} + bx + c = 0 graphically, we first draw the graph of y = ax^{2} +bx +c .

The solutions of the quadratic equation are the x coordinates of the points of intersection of the curve with X axis.

To find the questions i and ii, please visit the page "How to Find Nature of Solution of Quadratic Equation with Graph"

To find the questions iii and iv, please visit the page "Finding Nature of Quadratic Equation by Graphing"

**Question 1 :**

Graph the following quadratic equations and state their nature of solutions.

(v) x^{2} - 6x + 9 = 0

**Solution :**

Draw the graph for the function y = x^{2} - 6x + 9

Let us give some random values of x and find the values of y.

x -4 -3 -2 -1 0 1 2 3 4 |
x 16 9 4 1 0 1 4 9 16 |
-6x -24 -18 -12 -6 0 -6 -12 -18 -24 |
+9 9 9 9 9 9 9 9 9 9 |
y 1 0 1 4 9 4 1 0 1 |

**Points to be plotted :**

(-4, 1) (-3, 0) (-2, 1) (-1, 4) (0, 9) (1, 4) (2, 1) (3, 0) (4, 1)

To find the x-coordinate of the vertex of the parabola, we may use the formula x = -b/2a

x = -(-6)/2(1) = 6/2 = 3

By applying x = 3, we get the value of y.

y = 3^{2} - 6(3) + 9

y = 9 - 18 + 9

y = 0

Vertex (3, 0)

The graph of the given parabola intersect the x-axis at the one point. Hence it has real and equal roots.

(vi) (2x - 3)(x + 2) = 0

**Solution :**

**(2x - 3)(x + 2) = 0**

**2x ^{2} + 4x - 3x - 6 = 0**

**2x ^{2} + x - 6 = 0**

Let us give some random values of x and find the values of y.

y = **2x ^{2} + x - 6**

x -4 -3 -2 -1 0 1 2 3 4 |
2x 32 18 8 2 0 1 8 18 32 |
x -4 -3 -2 -1 0 1 2 3 4 |
-6 -6 -6 -6 -6 -6 -6 -6 -6 -6 |
y 22 9 0 -5 -6 -4 4 15 30 |

**Points to be plotted :**

(-4, 22) (-3, 9) (-2, 0) (-1, -5) (0, -6) (1, -4) (2, 4) (3, 15) (4, 30)

To find the x-coordinate of the vertex of the parabola, we may use the formula x = -b/2a

x = -1/2(2) = 1/4

By applying x = 1/4, we get the value of y.

y = **2(1/4) ^{2} + (1/4) - 6**

y = 2(1/16) + (1/4) - 6

y = -45/8

Vertex (1/4, -45/8)

The graph of the given parabola intersects the x-axis at two points. Hence it has two real and unequal roots.

After having gone through the stuff given above, we hope that the students would have understood, "Graphing Quadratic Equation and Find the Nature of Roots".

Apart from the stuff given in this section "Graphing Quadratic Equation and Find the Nature of Roots", if you need any other stuff in math, please use our google custom search here.

HTML Comment Box is loading comments...

**WORD PROBLEMS**

**HCF and LCM word problems**

**Word problems on simple equations **

**Word problems on linear equations **

**Word problems on quadratic equations**

**Area and perimeter word problems**

**Word problems on direct variation and inverse variation **

**Word problems on comparing rates**

**Converting customary units word problems **

**Converting metric units word problems**

**Word problems on simple interest**

**Word problems on compound interest**

**Word problems on types of angles **

**Complementary and supplementary angles word problems**

**Markup and markdown word problems **

**Word problems on mixed fractrions**

**One step equation word problems**

**Linear inequalities word problems**

**Ratio and proportion word problems**

**Word problems on sets and venn diagrams**

**Pythagorean theorem word problems**

**Percent of a number word problems**

**Word problems on constant speed**

**Word problems on average speed **

**Word problems on sum of the angles of a triangle is 180 degree**

**OTHER TOPICS **

**Time, speed and distance shortcuts**

**Ratio and proportion shortcuts**

**Domain and range of rational functions**

**Domain and range of rational functions with holes**

**Graphing rational functions with holes**

**Converting repeating decimals in to fractions**

**Decimal representation of rational numbers**

**Finding square root using long division**

**L.C.M method to solve time and work problems**

**Translating the word problems in to algebraic expressions**

**Remainder when 2 power 256 is divided by 17**

**Remainder when 17 power 23 is divided by 16**

**Sum of all three digit numbers divisible by 6**

**Sum of all three digit numbers divisible by 7**

**Sum of all three digit numbers divisible by 8**

**Sum of all three digit numbers formed using 1, 3, 4**

**Sum of all three four digit numbers formed with non zero digits**

**Sum of all three four digit numbers formed using 0, 1, 2, 3**

**Sum of all three four digit numbers formed using 1, 2, 5, 6**