Question

(x-6) (x+5)+x=51 qual a resposta

Answer 1

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

$x^2+5x-6x-30+x=51 \\ \\ x^2+6x-6x-30-51=0 \\ \\ x^2-81=0 \\ \\ x^2=81 \\ \\ x^2=+- \sqrt{81} \\ \\ x=+-9$

Answer 2

( x - 6 ) ( x + 5 ) + x = 51
x² - 6x + 5x - 30 + x - 51 = 0
x² - 30 - 51 = 0
x² - 81 = 0
x² = 81
x = + -  √81
x = + - 9

S = {  - 9   e  +  9  }