Question

simplifique a questão:
a) (x-3)^2+(x+3)^2
b) (a-b)^2 - (a+b)(a-b)

Answer 1

a)

x^2 + 9 + x^2 + 9

R: 2x^2 + 18

b)

(a-b)^2 = a^2-2ab+b^2

(a+b)(a-b) = a^2-ab+ab-b^2 =a^2-b^2

a^2-2ab+b^2 - (a^2-b^2)

a^2 -2ab +b^2 -a^2 +b^2

R: -2ab+2b^2