Question

Solve the following quadratic equation by factorization method x+x=20

Answer 1

It may be like this :

x² + x = 20

=> x² + x - 20 = 0

Splitting the middle term, we get

=> x² +5x-4x-20=0

=> x(x+5)-4(x+5)=0

=> (x+5)(x-4)=0

=> x+5 = 0 or x-4 = 0

=> x = -5 or x = 4

Therefore,

x = -5 , x = 4

••••

Answer 2

X+X=20

2x=20

X=20/2

X=10