Question

(X-1) (X-7)
Me ajudem !!!

Answer 1

Aplique a distributiva

(X-1) . (X-7)

X² - 7X - X +7 =

X² - 8X + 7

Answer 2

${x }^{2} - 7x - x + 7 = 0 \\ {x}^{2} - 8x + 7 = 0 \\ delta = {( - 8) }^{2} - 4.1.7 \\ delta = 64 - 28 = 36 \\x = \frac{ - ( - 8) +6 }{2} \\ x = 7 \\x = \frac{8 - 6}{2} = 1$