can u do test 1 section 3 #15?

Sure! This one is all about corresponding coefficients of equivalent polynomials. When you expand what you’re given…


…you can conclude that the corresponding coefficients of x^2 and x are equal. In other words, you know that ab=15 and 7a+2b=c. Since the question also tells you that a+b=8, you know that either a=3 and b=5 or a=5 and b=3. (Otherwise, ab won’t equal 15!)

The two possible values for c, then, are:


That’s answer choice D.

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