Question

qual o seultado de ( x + 5).( x - 6) = 51 - x

Answer 1

(x+5).(x-6)=51-x
x^2-6x+5x-30=51-x
x^2-6x+5x+x-30-51
x^2-6x+6x-81
x^2-81=0
x^2=0+81
x^2=81
x= raiz de 81
x=-/+ 9
S={-9, +9}