Question

Упростите выражение:

Answer 1

a) (x - 9)² - (8 - x)(x + 26) = x² - 18x + 81 - (8x + 208 - x² - 26x) =

= x² - 18x + 81 + 18x - 208 + x² = 2x² - 127

б) (a + 2)² - (a - 3)(a + 3) - 4(a - 5) = a² + 4a + 4 - (a² - 9) - 4a + 20 =

= a² + 24 - a² + 9 = 33