Kurangkanlah

Jawaban:

A. 5x – 9

7x + 15y

________ –

–2x + 15y – 9

B. 5x – 3y + 7

5y – 3x

___________ –

8x – 8y + 7

C. -x² – 6xy + 3y²

5x² – 9xy – 4y²

____________ –

–6x² + 3xy + 7y²