a = (x - 2)(2x + 4) + (x - 2)(x + 1) = 2x² + 4x - 4x - 8 + x² + x - 2x - 2 =
= 3x² - x - 10
c = 25 + 30x + 9x² = (5 + 3x)²
a = (x - 2)(2x + 4) + (x - 2)(x + 1) = 2x² + 4x - 4x - 8 + x² + x - 2x - 2 =
= 3x² - x - 10
c = 25 + 30x + 9x² = (5 + 3x)²