If a + b = 10 and a – b = 4, what is the value of a * b?

Topic: Basic Algebra &amp; Equations
Subtopic: Simultaneous Equations

A16

B21

C24

D28

Explanation

Adding equations: 2a = 14 => a = 7. Subtracting equations: 2b = 6 => b = 3. Product ab = 7 * 3 = 21.

Exam Relevance

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