Identify Quadratic Expression: Identify the quadratic expression to be factored.The given quadratic expression is 3x2−7x−10. We need to find two numbers that multiply to give the product of the coefficient of x2 (which is 3) and the constant term (which is −10), and add up to the coefficient of x (which is −7).
Find Suitable Numbers: Find two numbers that meet the criteria.We are looking for two numbers that multiply to −30 (3×−10) and add up to −7. The numbers that meet these criteria are −10 and +3 because (−10)×(+3)=−30 and (−10)+(+3)=−7.
Rewrite Middle Term: Rewrite the middle term using the two numbers found.We can express −7x as −10x+3x. So, the expression 3x2−7x−10 can be rewritten as 3x2−10x+3x−10.
Factor by Grouping: Factor by grouping.Now we group the terms: 3x2−10x + 3x−10. We can factor out an x from the first group and a 3 from the second group: x(3x−10)+3(3x−10).
Factor out Common Binomial: Factor out the common binomial factor.Since both groups contain the common binomial factor (3x−10), we can factor it out: (3x−10)(x+3).
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