Odpowiedź:
a) 5x² - 6x - 3x² + 7 - x² + 6x = x² + 7
b) -4(-2a - 2b) - 2a(4 - 3a + 2b) = 8a + 8b - 8a + 6a² - 4ab = 6a² + 8b - 4ab
c) (4 - 3x)(2x + 3) - 5 = 8x + 12 - 6x² - 9 = - 6x² + 8x + 3
d) (3 - 2x)(4x - 5) - 3x(2x + 1) = 12x - 15 - 8x² + 10 - 6x² - 3 = - 14x² + 12x - 18
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Odpowiedź:
a) 5x² - 6x - 3x² + 7 - x² + 6x = x² + 7
b) -4(-2a - 2b) - 2a(4 - 3a + 2b) = 8a + 8b - 8a + 6a² - 4ab = 6a² + 8b - 4ab
c) (4 - 3x)(2x + 3) - 5 = 8x + 12 - 6x² - 9 = - 6x² + 8x + 3
d) (3 - 2x)(4x - 5) - 3x(2x + 1) = 12x - 15 - 8x² + 10 - 6x² - 3 = - 14x² + 12x - 18