Question

Add a2 + b2 to the sum of 5a2 -b2 +6 and -4a2 -b2 +15.​

Answer 1

hey buddy here is your answer

(5a^2-b^2+6)+(-4a^2-b^2+15)

=5a^2-b^2+6-4a^2-b^2+15

=a^2-2b^2+21

now add this with a^2+b^2

a^2+b^2+a^2-2b^2+21

=2a^2-b^2+21

hope it helps

mark the brainliest.