1. 10x² + xy - 21y?
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Step-by-step explanation:
Answer:
(2x+3y)(5x-7y)
Step-by-step explanation:
10x²+xy-21y²
= 10x²+15xy-14xy-21y²
= 5x(2x+3y)-7y(2x+3y)
= (2x+3y)(5x-7y)
Therefore,
10x²+xy-21y² = (2x+3y)(5x-7y)
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