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For integers x and y, which of the following MUST be an integer?
\( A. \ \sqrt{25x^2+30xy+36y^2} \)
\( B. \ \sqrt{49x^2−84xy+36y^2} \)
\( C. \ \sqrt{16x^2−y^2} \)
\( D. \ \sqrt{64x^2−64xy−64y^2} \)
\( E. \ \sqrt{81x^2+25xy+16y^2} \)
The OA is the option _B_
Source: Veritas Prep
\( A. \ \sqrt{25x^2+30xy+36y^2} \)
\( B. \ \sqrt{49x^2−84xy+36y^2} \)
\( C. \ \sqrt{16x^2−y^2} \)
\( D. \ \sqrt{64x^2−64xy−64y^2} \)
\( E. \ \sqrt{81x^2+25xy+16y^2} \)
The OA is the option _B_
Source: Veritas Prep
Last edited by M7MBA on Tue Jun 25, 2019 6:15 am, edited 1 time in total.
