Identify Coefficients: Identify the coefficients of the quadratic expression.The quadratic expression is 7s2−9s+2. Here, the coefficient of s2(a) is 7, the coefficient of s(b) is −9, and the constant term (c) is 2.
Find Multiplying Numbers: Find two numbers that multiply to ac (7×2=14) and add up to b (−9).We need to find two numbers that multiply to 14 and add up to −9. The numbers that satisfy these conditions are −7 and −2 because −7×−2=14 and −7+−2=−9.
Rewrite Middle Term: Rewrite the middle term using the two numbers found in the previous step.We can express −9s as −7s−2s, so the expression becomes 7s2−7s−2s+2.
Factor by Grouping: Factor by grouping.Group the terms into two pairs: (7s2−7s) and (−2s+2). Factor out the greatest common factor from each pair. From the first pair, we can factor out 7s, and from the second pair, we can factor out −2.This gives us 7s(s−1)−2(s−1).
Factor Common Binomial: Factor out the common binomial factor.Both terms have a common factor of (s−1), so we can factor this out to get (s−1)(7s−2).