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b. 2a+3+a+5 = 3a+8
a. x²y+2xy
b. 15-10x+3x-2x² = 14-7x-2x²
soal A
= x + 3y -( -2x - 4y)
= x + 3y +2x +4y
= 3x + 7y
soal B
= -a -5 -(2a+3)
= -a -5 -2a -3
= -3a -8
Selesaikan perkalian berikut :
soal A
= xy ( x + 2 )
= x²y + 2xy
soal B
= ( 5 + x ) ( 3 - 2x )
= 15 - 10x + 3x - 2x²
= -2x² - 7x + 15