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The problem

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i need assitance with this formula being factored in ac

4b2 − 16b + 15 = (2b − 5) and 20w2 + 100w + 40 the calculator does not tell me if it is ac

Answer provided by our tutors

...the term "ac" idea what is being referred to.  The simplification you provided is identifying common terms and add/subtracting in order to isolate the variable on the leftside and any numeric term on the rightside.  Hence, on the leftside the addition "4b2-16b-2b" results in "-10b" and the rightside reduces to "-20".  The final result in division of both sides by -10, leaving "b=2". 

It is possible that your inquiry is really meaning "4b^2" rather than "4b2".  and that results in a solution set {5/2, 2}.  If so, then perhaps "ac" is referring to "alternating current". 

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