Identify Variables: Identify a, b, and c in the quadratic expression u2+7u+10. The quadratic expression is in the form of au2+bu+c. For our expression, a=1, b=7, and c=10.
Find Multiplying Numbers: Find two numbers that multiply to a∗c (which is 10) and add up to b (which is 7).We need to find two numbers that multiply to 10 and add up to 7. The numbers 2 and 5 satisfy these conditions because 2×5=10 and 2+5=7.
Write Quadratic Expression: Write the quadratic expression using the two numbers found in Step 2.We can express u2+7u+10 as u2+2u+5u+10.
Factor by Grouping: Factor by grouping.Group the terms to factor by grouping: (u2+2u)+(5u+10).
Factor Common Factors: Factor out the common factors from each group.From the first group u2+2u, we can factor out a u, giving us u(u+2).From the second group 5u+10, we can factor out a 5, giving us 5(u+2).
Write Factored Form: Write the factored form using the common binomial.Since both groups contain the common binomial (u+2), we can factor it out to get the final factored form: (u+2)(u+5).
More problems from Factor quadratics with leading coefficient 1