1.

If ab = 21 and $$\frac{{{{\left( {a + b} \right)}^2}}}{{{{\left( {a - b} \right)}^2}}}$$= $$\frac{{25}}{4}{\text{,}}$$then the value of a2 + b2 + 3ab is?

A. 15
B. 21
C. 25
D. 27
Answer» C. 25


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