If a + b = 10 and ab = 9, then the value

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If a + b = 10 and ab = 9, then the value of a - b is:

Options:

Correct Answer:

Explanation:

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