Q. Which of the following is equivalent to the expression x2−5x−14 ?Choose 1 answer:(A) (x−14)(x+1)(B) (x−7)(x+2)(C) (x−2)(x+7)(D) (x−1)(x+14)
Factor the quadratic expression: Factor the quadratic expression x2−5x−14.To factor a quadratic expression of the form ax2+bx+c, we need to find two numbers that multiply to ac (the product of the coefficient of x2 and the constant term) and add up to b (the coefficient of x).Here, a=1, b=−5, and c=−14.We need two numbers that multiply to (1)(−14)=−14 and add up to ax2+bx+c0.
Find two numbers: Find two numbers that multiply to −14 and add up to −5.The numbers −7 and +2 multiply to −14 and add up to −5.−7×2=−14−7+2=−5
Write the factored form: Write the factored form using the two numbers found in Step 2.The quadratic expression x2−5x−14 can be factored as (x−7)(x+2).
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