B) solve by factorisation x { }^(2) + x - 72 = 0 ​

Question

B) solve by factorisation

`x { }^(2) + x - 72 = 0`
​

Answer 1

QUESTION:- SOLVE EQUATION BY FACTORISATION

EQUATION:-

`{x}^(2) + x - 72 = 0`

ANSWER:-

`{x}^(2) + x - 72 = 0\\{x}^(2) + 9x - 8x - 72 = 0 \\ x(x + 9) - 8(x +9) = 0 \\ (x - 8)(x + 9) = 0 \\`

NOW FOR VALUE OF X ->

`x - 8 = 0 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x + 9 = 0\\ x = 8 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x = - 9`