Question

If ab=10, a²=5 and b²=2, then find the value of a+b

Answer 1

a+b

√(a+b)²

=√(a²+2ab+b²)

=√(5+2*10+2)

=√(7+20)

=√27

5.19615242271

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Hope it helps

Answer 2

(a+b)^2= a^2+b^2+2ab

(A+b)^2=5+2+2x10

A+b= √27