Identify Coefficients: Identify the coefficients of the quadratic expression.The quadratic expression is 3x2+8x−3. Here, the coefficient of x2(a) is 3, the coefficient of x(b) is 8, and the constant term (c) is −3.
Find Multiplying Numbers: Look for two numbers that multiply to ac (a times c) and add up to b. We need to find two numbers that multiply to (3)(−3)=−9 and add up to 8. The numbers that satisfy these conditions are 9 and −1, because 9×(−1)=−9 and 9+(−1)=8.
Rewrite Middle Term: Rewrite the middle term using the two numbers found in Step 2.We can express 8x as 9x−x. So, the expression 3x2+8x−3 can be rewritten as 3x2+9x−x−3.
Factor by Grouping: Factor by grouping.We group the terms as follows: 3x2+9x + −x−3. Now we factor out the common factors from each group. From the first group, we can factor out 3x, and from the second group, we can factor out −1.This gives us: 3x(x+3)−1(x+3).
Factor Common Binomial: Factor out the common binomial factor.We notice that (x+3) is a common factor in both terms. Factoring this out gives us: (x+3)(3x−1).