Question

Solve the following quadratic equations by factorisation
method.
(i) x2 + 8x + 15 = 0.
(March '19​

Answer 1

Answer:

The solution of given quadratic equation is -3,-5

Step-by-step explanation:

Equation :x^2 + 8x + 15 = 0.x

2

+8x+15=0.

We are supposed to find the solution of quadratic equation .

x^2+8x+15=0x

2

+8x+15=0

x^2+5x+3x+15=0x

2

+5x+3x+15=0

x(x+5)+3(x+5)=0x(x+5)+3(x+5)=0

(x+3)(x+5)=0(x+3)(x+5)=0

x=-3,-5x=−3,−5

Step-by-step explanation:

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Answer 2

Answer:

x² + 8x + 15 = 0

so, x² + 5x + 3x + 15 = 0

so, X ( X + 5 ) + 3 ( X + 5 ) = 0

so, ( X + 5 ) ( X + 3 ) = 0

so, X + 5 = 0. or. X + 3 =0

so, X = -5. or. X = -3