The first three steps for solving the quadratic equation 8x^2+80x=-5 by completing the square are shown. Fill in the missing number in the last step

8x^2+80x=-5

8 (x^2+10x) = - 5

8 (x^2+10x+25) = - 5 + ?

A) - 200

B) - 25

C) 25

D) 200

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How do you solve 1/2x<13?

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Explain why the product (3x^-3) (3x^3) is a constant.