Odpowiedź:
a) (4a + 3) (b + 5) = 4ab + 3b + 20a + 15
b) (5a - b) (a -3) = 5a² - 15a - ba + 3b
c) (3x - y) (2x + y) = 6x² - 3xy + 3xy - y² = 6x² - y² + xy
d) (2xy + 3x) (xy - 2x) = 2x²y² + 3x²y - 4x²y - 6x² = 2x²y² - x²y - 6x²
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Odpowiedź:
a) (4a + 3) (b + 5) = 4ab + 3b + 20a + 15
b) (5a - b) (a -3) = 5a² - 15a - ba + 3b
c) (3x - y) (2x + y) = 6x² - 3xy + 3xy - y² = 6x² - y² + xy
d) (2xy + 3x) (xy - 2x) = 2x²y² + 3x²y - 4x²y - 6x² = 2x²y² - x²y - 6x²