1) (x - 2)(x + 2) - x(x - 3) = х²-4-х²+3х = 3х-4
2) (a + 3)² + (а - 8)(a + 2) = а²+6а+9+а²+2а-8а-16 = 2а²-7
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1) (x - 2)(x + 2) - x(x - 3) = х²-4-х²+3х = 3х-4
2) (a + 3)² + (а - 8)(a + 2) = а²+6а+9+а²+2а-8а-16 = 2а²-7