Question

Factorization
(i) x2 + 15x - 100​

Answer 1

Answer:

${x}^{2} + 15x - 100 \\ {x}^{2} + 20x - 5x - 100 \\ = x(x + 20) - 5(x + 20) \\ = (x + 20)(x - 5)$

Answer 2

Answer:

x2+20x-5x-100= x(x+20)-5(x+20)=(x-5)(x+20) and hence x=5 or x = - 20