add 5x^2+6xy+7yz+8and 8x^2 -9xy+7yz -9
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Answer:
13x^2 - 2xy + 14 yz - 1
Step-by-step explanation:
(5x^2 + 6xy + 7 yz + 8) + (8x^2 - 9xy + 7yz -9)
= 5x^2 + 6xy + 7yz + 8 + 8x^2 - 9xy + 7yz- 9
= 13x^2 - 3xy + 14 yz - 1
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