(х-7)²-х(6+х)при х=-1\20

Question

(х-7)²-х(6+х)при х=-1\20

Answer 1

X^2-2*x*7+7^2-6x-x^2
x^2-14x+49-6x-x62=0
x^2-14x-6x-x^2=49
-20x=49
-20* -1/20=49
-1=49