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Expansion of (x-y)^2

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Question

Dear sir/Ma'am
I have a problem in solving this question
Q.find the value
(-3)^4×(5/3)^4

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Solution

(-3)^4 × (5/3)^4
= (-3×-3×-3×-3) × (5/3)^4
= (-1×3)^4 × (5/3)^4
= (-1)^4 × 3^4 × (5/3)^4
= 1 × 3^4 × (5^4 / 3^4)
= 1× 5^4
= 5^4
= 625.

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