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Find 5^2 + 6^2 + 7^2 + …. + 30^2...

Find `5^2 + 6^2 + 7^2 + …. + 30^2`

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Subtract the first polynomial from the second : 5a^2 - 2a , 7a^2 + 5a + 6 .

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Find (d^2 y)/(dx^2) of the following: y= x^3 + 5 x^2 -7 x + 10