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If a + 5b = 25 and ab = 20, then one of the values of (a - 5b) is: |
15 14 16 13 |
15 |
If a + 5b = 25 ab = 20, then one of the values of (a - 5b) = ? If x + y = n then, x - y = \(\sqrt {n^2 - 4xy}\) then, (a - 5b) = \(\sqrt {25^2 - 4(20)}\) = 15 |
