a)
(x + 1)(x - 2) + (x + 2)(x - 1) = x² - 2x + x - 2 + x² - x + 2x - 2 = 2x² - 4
b)
(4y + 3)(y - 2) - 2y(4 - 2y) = 4y² - 8y + 3y - 6 - 8y + 4y² = 8y² - 13y - 6
x²-2x+x-2+x²-x+2x-2=2x²-4
(4y+3)(y-2)+4y(y-2)=(y-2)(8y+3)=8y²+3y-16y-6=8y²-13y-6
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a)
(x + 1)(x - 2) + (x + 2)(x - 1) = x² - 2x + x - 2 + x² - x + 2x - 2 = 2x² - 4
b)
(4y + 3)(y - 2) - 2y(4 - 2y) = 4y² - 8y + 3y - 6 - 8y + 4y² = 8y² - 13y - 6
a)
x²-2x+x-2+x²-x+2x-2=2x²-4
b)
(4y+3)(y-2)+4y(y-2)=(y-2)(8y+3)=8y²+3y-16y-6=8y²-13y-6