(3x³-2x²-7)(8x²-8x+7)
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What are we to do with this?. Solve?. Expand?.
The worksheet says simplify. I have worked it three times, and keep coming up with the same answer, but it is not the correct answer.
$\displaystyle (3x^3-2x^2-7)(8x^2-8x+7)=24x^5-40x^4+37x^3-70x^2+56x-49$
I don't know what they mean by simplify. What you posted is the factorization of the quintic red dog showed you. It's already 'simplified'. Are you sure it isn't division?. $\displaystyle \frac{3x^{3}-2x^{2}-7}{8x^{2}-8x+7}$
I copied exactly from the college prep packet I got. I think you're right, though. I think it's supposed to be addition or subtraction. Thank you for helping...I appreciate it.
I just worked it as addition and subtraction, and it is neither. The answer in the back is 3x³-10x²+8x+11
If they were subtracted it would be: $\displaystyle 3x^{3}-10x^{2}+8x-14$ Added it would be $\displaystyle 3x^{3}+6x^{2}-8x$ I don't know what they're doing. But, $\displaystyle (3x^{3}-2x^{2}+7)-(8x^{2}-8x-4)=3x^{3}-10x^{2}+8x+11$
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