Simplify (2x+5)²-(2x-5)²
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Answer:
={(2x)²+2(2x)(5)+(5)²} - {(2x)²-2(2x)(5)+(5)²}
={4x²+20x+25} - {4x²-20x+25}
=4x²+20x+25-4x²+20x-25
=20x+20x
=40x
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