If - 1 ≤ x ≤ 8 and - 1 ≤ y ≤ 10, then what is the range of xy?

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Martin Mccall

SAT

31 August, 07:40

If - 1 ≤ x ≤ 8 and - 1 ≤ y ≤ 10, then what is the range of xy?

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Turner Ross · Answer 1

the lower bound would be the smallest value xy could produce, which is smallest value of x times the largest value of y, - 1 times 10 is - 10. the upper bound would be the largest value of xy, which is the largest value of both variables, 8 times 10 is 80. hence the range of xy is - 10< = xy <=80.