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b.9 dari 2
⇔7x+15y-5x-9y
⇔ 7x-5x+15y-9y
⇔ 2x+6y
b. 5x-3y+7 dri 5y-3x-4
⇔ 5y-3x-4-5x-3y+7
⇔ 5y-3y-3x-5x-4+7
⇔2y-8x+3
c. -x²+6xy+3y² dari 5x²-9xy-4y²
⇔ (5x²-9xy-4y²)-(-x²+6xy+3y²)
⇔ 5x²-9xy-4y²+x²+6xy+3y²
⇔ 5x²+x²-9xy+6xy-4y²+3y²
⇔6x²-3xy-y²
smgga membantu :)