Question

(x-6 ) (x+5) + x = 51

Answer 1

(x-6 ) (x+5) + x = 51
x^2 + 5x - 6x - 30 + x = 51
x^2 - 81 = 0
x^2 = 81
x = +- √ 81
x = +- 9

S = { 9 ; - 9 }