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CUET
General Test
Quantitative Reasoning
Algebra
If a + b = 10 and ab = 9, then the value of a - b is:
7
5
8
6
If a + b = 10
ab = 9,
Then the value of a - b
If x + y = n
then, x - y = \(\sqrt {n^2 - 4xy}\)
a - b = \(\sqrt {10^2 - 4 × 9}\) = 8
