Question the-pr
The product of two positive integers is . If the first integer is greater than twice the second integer, what is the smaller of the two integers?
The product of two positive integers is 462 . If the first integer is 5 greater
Hard-difficulty · SAT Math · Nonlinear Equations in One Variable — Quadratic solving (factoring, quadratic formula, completing square). Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
The correct answer is . Let represent the first integer and represent the second integer. If the first integer is greater than twice the second integer, then . It's given that the product of the two integers is ; therefore . Substituting for in this equation yields , which can be written as . Subtracting from each side of this equation yields . The left-hand side of this equation can be factored by finding two values whose product is , or , and whose sum is . The two values whose product is and whose sum is are and . Thus, the equation can be rewritten as , which is equivalent to , or . By the zero product property, it follows that or . Subtracting from both sides of the equation yields . Dividing both sides of this equation by yields . Since is a positive integer, the value of isn't . Adding to both sides of the equation yields . Substituting for in the equation yields . Dividing both sides of this equation by yields . Therefore, the two integers are and , so the smaller of the two integers is .
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