Question

buenas noches porfavor me ayudarie conesto (x+4)(x-2)=10

Answer 1

(X + 4)(X - 2) = 10

(X + 4)(X - 2) = X² - 2X + 4X - 8

X² + 2X - 8 = 10

X² +2X - 18 = 0;  Donde a = 1; b = 2;  c = -18

$X=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$X=\frac{-2\pm \sqrt{2^2-4(1)(-18)}}{2(1)}$

$X=\frac{-2\pm \sqrt{4+72}}{2}$

$X=\frac{-2\pm \sqrt{76}}{2}$

$X=\frac{-2\pm \ 8.71779}{2}$

X1 = [-2 + 8.71779]/2 = 3.358895

X2 = [-2 - 8.71779]/2 = -5.358895