Uzupełnij w miejsce kropek odpowiednie działania
a)(x+1)^2+ x+1=(x+1)(..........)=............................
b)(2x-7)^3 -(2x-7)^2=(2x-7)^2(......................)=.................
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a)
(x + 1)² + x + 1 = (x + 1)(x + 1 + 1) = (x + 1)(x + 2) = x² + 2x + x + 2 = x² + 3x + 2
b)
(2x - 7)³ - (2x - 7)² = (2x - 7)²(2x - 7 - 1) = (2x - 7)²(2x - 8) = (4x² - 28x + 49)(2x - 8) = 8x³ - 32x² - 56x² + 224x + 98x - 392 = 8x³ - 88x² + 322x - 392