If a + b = 10 and ab = 9, then the value of a - b is:
Answer & explanation
Correct answer: option 3
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
If a + b = 10 and ab = 9, then the value of a - b is:
Correct answer: option 3
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