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What is 9 to the 2nd power plus -7 to the 3rd power plus -6 to the 2nd power x 5

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I never know if these questions are serious, but I'll play along.

Remember the definition of a power: it's a number multiplied by itself that many times. For example, 4 to the 3rd power (4^3) is 4 X 4 X 4, or 64. So the problem you list can be written

9^2 + (-7^3) + (-6^2) + 5, or

9 X 9 + (-7 X -7 X -7) + (-6 X -6) + 5

Don't forget that negative X negative = positive when multiplying.

81 + (-343) + 36 + 5 = -221

Posted on Mar 16, 2011


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