(x-7)²-x(6+x) при х=-1/20

Question

(x-7)²-x(6+x) при х=-1/20

Answer 1

(x-7)² - x(6+x)= x²-14x+49-6x-x² = 49-20x
x=-1/20
49 - 20*(-1/20) = 49 + 1 = 50