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Thomson
@Thomson
September 2021
2
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(7x+5y)^3 - (7x-5y)^3 - 30y (7x+5y) (7x-5y)^3
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(7x+5y)^3 - (7x-5y)^3 - 30y (7x+5y) (7x-5y)
= a^3 - b^3 - 30y (ab)
= (a-b)^3 + 3ab(a-b) - 30aby
= (10y)^3 + 3ab(10y) - 30aby
= 1000y^3 + 30aby - 30aby
= 1000y^3
Hope it will help you .
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Thank you
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Answers & Comments
= a^3 - b^3 - 30y (ab)
= (a-b)^3 + 3ab(a-b) - 30aby
= (10y)^3 + 3ab(10y) - 30aby
= 1000y^3 + 30aby - 30aby
= 1000y^3
Hope it will help you .
please follow me..............