Identify Coefficients: Identify the coefficients of the quadratic expression.The quadratic expression is 2x2−9x−5. Here, a=2 (coefficient of x2), b=−9 (coefficient of x), and c=−5 (constant term).
Find Multiplying Numbers: Determine two numbers that multiply to ac (a times c) and add up to b. We need to find two numbers that multiply to (2)(−5)=−10 and add up to −9.
Determine Numbers: Find the two numbers that meet the criteria.The numbers −10 and 1 multiply to −10 and add up to −9. So, we can write −9x as −10x+x.
Rewrite Expression: Rewrite the quadratic expression using the two numbers found.The expression 2x2−9x−5 can be rewritten as 2x2−10x+x−5.
Factor by Grouping: Factor by grouping.Group the terms to factor by grouping: (2x2−10x)+(x−5).
Factor Common Factors: Factor out the common factors from each group.From the first group, 2x2−10x, we can factor out 2x to get 2x(x−5). From the second group, x−5, we can factor out 1 to get 1(x−5).
Write Factored Form: Write the factored form by combining the common factors.Since both groups contain the factor (x−5), we can combine them to get the factored form: 2x(x−5)+1(x−5).
Combine Common Factors: Combine the common factors to complete the factoring.The final factored form is (2x+1)(x−5).