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= (10 x y) - (10 x 10)
= 10y - 100
b. (x + 3) (x + 5)
x² + 5x + 3x + 15
x² + 8x + 15 .
maaf klau slah.
b. (x+3) (x+5)=x×x + x×5 +x×3=x2+5x+3x=x2+8x
x2=x pangkat 2