Odpowiedź:
Szczegółowe wyjaśnienie:
a) (a+3b)(7a+2b) = 7a² + 2ab + 21ab + 6b² = 7a² + 23ab + 6b²
b) 5 - (x+3)(x+1) = 5 - (x² + 1x + 3x + 3) = 5 - (x² + 4x + 3) = 5 - x² - 4x - 3 = 2 - x² - 4x
c)t - (t+3)(t-5) = t - (t² - 5t + 3t - 15) = t - (t² - 8t - 15) = t - t² + 8t + 15 = -t² + 9t + 15
d) 2y - (3y-1)(y-2) = 2y - (3y² - 6y -1y + 2) = 2y - (3y² - 7y + 2) = 2y - 3y² + 7y - 2 = 9y - 3y² - 2
licze na NAJ :)))
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Odpowiedź:
Szczegółowe wyjaśnienie:
a) (a+3b)(7a+2b) = 7a² + 2ab + 21ab + 6b² = 7a² + 23ab + 6b²
b) 5 - (x+3)(x+1) = 5 - (x² + 1x + 3x + 3) = 5 - (x² + 4x + 3) = 5 - x² - 4x - 3 = 2 - x² - 4x
c)t - (t+3)(t-5) = t - (t² - 5t + 3t - 15) = t - (t² - 8t - 15) = t - t² + 8t + 15 = -t² + 9t + 15
d) 2y - (3y-1)(y-2) = 2y - (3y² - 6y -1y + 2) = 2y - (3y² - 7y + 2) = 2y - 3y² + 7y - 2 = 9y - 3y² - 2
licze na NAJ :)))