If a + b = 7and a – b = 3, then the value of ab is
A. 10 B. 40 C. 4 D. 21
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Answer:
let the value of a be 5
the value of b be 2
a + b = 7
5 + 2 = 7
a - b = 3
5 - 2 = 3
Now, let's find value of ab
a × b
5 × 2
10
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