Question

If a+b=9 and ab=10 find the value of a^2+b^2

Answer 1

Answer:

(a+b)²=a²+b²+2ab

a²+b²=(a+b)²-2ab

= (9)²-2(10)

=81-20

= 61

Answer 2

Answer:

Hello

First we can write it as [a+b] ^ - 2ab

As a+b=9

And ab=10

Then [9]^-2*10

=81-20

=61

Good day