Question

Упростите выражение:
a)(a+3)2-(a-2)(2+a)
b)(x-7)x+(x+3)2

Answer 1

1) a^2 + 6a + 9 - ( a^2 - 4) = a^2 + 6a + 9 - a^2 + 4 = 6a + 13
2) x^2 - 7x + x^2 + 6x +9 = 2x^2 - x + 9

Answer 2

a)
(a+3)² - (a-2)(2+a) = а² + 6а + 9 - а² + 4 = 6а + 13,
b)
(x-7)*x + (x+3)² = х² - 7х + х² + 6х + 9 = 2х² - х + 9