Question

If a+b=4 and ab=3.
Find 1/a^2 + 1/b^2

Answer 1

$\frac{10}{9 } \: is \: the \: answer$

Step-by-step explanation:

put a=3÷b in a+b=4

then b^2-4b+3=0 then b=1 or 3

similarly a=1 or 3

then1÷a^2+1÷b^2

=>1+1÷9

=>10÷9

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