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What is obtained by simplifying ( (5a-4b)^2+(5a+4b)^2 )?

Answer and explanation

Correct answer: (50a^2+32b^2)

The direct answer is C: \\((5a-4b)^2+(5a+4b)^2=50a^2+32b^2\\). Use \\((p-q)^2=p^2-2pq+q^2\\) and \\((p+q)^2=p^2+2pq+q^2\\), with \\(p=5a\\) and \\(q=4b\\). The first square is \\(25a^2-40ab+16b^2\\); the second is \\(25a^2+40ab+16b^2\\). Adding gives \\(50a^2+32b^2\\), because \\(-40ab+40ab=0\\). Therefore C is correct. Option A, \\(25a^2+16b^2\\), is only one square’s non-middle terms, so it misses the doubling. Option B, \\(40ab\\), is a middle term that cancels. Option D has the wrong negative sign for the b-squared term; squared terms add positively. Memory cue: adding opposite squares cancels the middle terms.

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Sum IdentityBinomial SquareExpert

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