If a - b = 2 and a2 + b2 = 39 - CUETMOCK

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If a - b = 2 and

a² + b² = 394,

then the value of ab is:

Options:

202

215

195

200

Correct Answer:

195

Explanation:

Given,

a - b = 2

a² + b² = 394 $a^{2} + b^{2} = 45$

( a - b )² = a² + b² - 2ab

4 = 394 - 2ab

ab = 195

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