Grace found a red dress that cost $90, but saves $27 by using a coupon. For what percentage off is this coupon?
1 answer:
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* </span><span>x-4/x^2-8x+16
Hope that helps
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Hope that helps
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First set the equation to zero by adding -400 to both sides.
Next factor 16
Divide through by 16
This is difference of two squares
Next factor 16
Divide through by 16
This is difference of two squares