Question

If a + b = 4 and ab = 3;
find:
$\frac{1}{ {b}^{2} } + \frac{1}{ {a}^{2} }$
​

Answer 1

ur ans

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Answer 2

(1/a²)+1/b²=a²+b²/a²b²

=(a+b)²-2ab/(ab)²

=(4²-6)/(3²)

=10/9