13. simplify:
(5x – 7y)³ + (5x +7y)³
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Answer:
250x³+1470xy²
Step-by-step explanation:
- (5x-7y)³+(5x+7y)³
- {(5x)³-(7y)³-3.5x.7y.(5x-7y)}+{(5x)³+(7y)³+3.5x.7y(5x+7y)
- 125x³-343y³-525x²y+735xy²+125x³+343y³+525x²y+735xy²
- 250x³+1470xy²
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