(4-x)(4+x)=x^2-2 heip

Question

(4-x)(4+x)=x^2-2
heip

Answer 1

Решение смотри в приложении

Answer 2

16 - x^2 = x^2 - 2
18 = 2x^2
x^2 = 9
x1 = -3; x2 = 3