Vas término por término:
(a + b)(a - b) = aa - ab + ba - bb
= a² - b²
(x² - 2x)(x + 1) = x²x + x² - 2xx - 2x1
= x³ + x² - 2x² - 2x
= x³ - x² - 2x
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Verified answer
Vas término por término:
(a + b)(a - b) = aa - ab + ba - bb
= a² - b²
(x² - 2x)(x + 1) = x²x + x² - 2xx - 2x1
= x³ + x² - 2x² - 2x
= x³ - x² - 2x