Question

Упростите выражение
(5x—2)×(x+1)—(5—2x)²
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Answer 1

$(5x - 2)(x + 1) - (5 - 2x) {}^{2} = 5 {x}^{2} + 5x - 2x - 2 - (25 - 20x + 4 {x}^{2} ) = 5 {x}^{2} + 3x - 2 - 25 + 20x - 4x {}^{2} = x {}^{2} + 23x - 27$