Question

Find the value of a² + b² , when a+ b = 8 and ab = 12

Answer 1

Here,

a2 +b2=(a+b)

`a {}^(2) + b {}^(2) = (a + b) {}^(2) - 2ab`so,

`(8) {}^(2) - 2 * 12`

`64 - 2 * 12`

`40`

Explanation:

So,

Therefore,

`a {}^(2) + b {}^(2) = 40`

I'm not sure if this is correct or not, but this the way I learned..

Answer 2

Explanation:

6+2=8

6*2=12

`6^(2)` +
`2^(2)`= 36+4=40