Q. Factor the quadratic expression completely.8x2−18x−5=
Identify Coefficients: Step Title: Identify the CoefficientsConcise Step Description: Identify the coefficients of the quadratic expression, which are the numbers in front of the variables. In this case, the coefficients are 8, −18, and −5.Step Calculation: Coefficients are 8, −18, −5Step Output: Coefficients: 8, −18, −5
Find Product and Sum: Step Title: Find the Product and SumConcise Step Description: Find two numbers that multiply to the product of the first and last coefficients 8×−5=−40 and add to the middle coefficient −18.Step Calculation: We need to find two numbers that multiply to −40 and add to −18.Step Output: After testing different combinations, we find that −20 and +2 multiply to −40 and add to −18.
Rewrite Middle Term: Step Title: Rewrite the Middle TermConcise Step Description: Rewrite the middle term of the quadratic expression using the two numbers found in the previous step.Step Calculation: Rewrite −18x as −20x+2x.Step Output: The expression becomes 8x2−20x+2x−5.
Factor by Grouping: Step Title: Factor by GroupingConcise Step Description: Group the terms into two pairs and factor out the greatest common factor from each pair.Step Calculation: Factor out 4x from the first pair and 1 (or just factor the sign) from the second pair.Step Output: The expression becomes 4x(2x−5)+1(2x−5).
Factor Out Common Binomial: Step Title: Factor Out the Common BinomialConcise Step Description: Factor out the common binomial factor from the two groups.Step Calculation: The common binomial factor is (2x−5).Step Output: The factored form is (2x−5)(4x+1).