CUET Preparation Today
If a + 2b = 10 and 2ab = 9, then |a - 2b| is equal to: |
4 6 8 2 |
8 |
If a + 2b = 10 2ab = 9, ab = 4.5 then |a - 2b|= ? If x + y = n then, x - y = \(\sqrt {n^2 - 4× x × y}\) = |a - 2b| = \(\sqrt {10^2 - 4× 2 × 4.5}\) = \(\sqrt {100 - 36}\) = 8 |
