Uprośc wyrażenie.
a) (x-3) (x+3) + (2+x) (2-x)
b) (x+ 3/2) (x- 3/2) - (x-1/2) (x+1/2)
c) (2y -3)do potęgi 2 - (3y-2) (3y+2)
Potrzebne na zaraz, dam naj;)
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a) (x-3) (x+3) + (2+x) (2-x) = (x² - 9) + (4 - x²) = -5
b) (x+ 3/2) (x- 3/2) - (x-1/2) (x+1/2) = x² - 9/4 - (x² - 1/4) =
= x² - 9/4 - x² + 1/4 = -8/4 = -2
c) (2y -3)do potęgi 2 - (3y-2) (3y+2) = (2y-3)² - (9y² - 4) =
= 4y²-12y+9-9y²+4= -5y² - 12y +13