Question

find the solution of quadratic equation x^2 - 9 X + 20 =0 by factorization method

Answer 1

x square - 5x + 20 = 0
x square - 5x - 4x +20 = 0
x ( x -5 ) - 4 ( x - 5 )
( x - 4 ) ( x - 5 )
x = 4 or x = 5

Answer 2

x^2-9x+20=0
Sum is -9 and product is 20
So the no.s are -4 and -5
x^2-4x-5x+20=0
x (x-4)-5(x-4)=0
Take (x-4) common
(x-4)(x-5)=0
x=4,5