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If q(x)=7x^2-1 find q(-9)

User Jon Kyte
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For this, we are just going to plug in -9 for every x and then solve the equation:



q(x)=7x^(2) -1



q(-9)=7(-9)^(2) -1



q(-9)=7(81)-1



q(-9)=566


Now we know that q(-9) is equal to 566.

User Pibo
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