Question

Solve for a.
p + a + r = k ​

Answer 1

a=k-p-r this is what I got!

Answer 2

Explanation:

sqrt(p+a)=k-r

we raised to the power of 2 both sides

(p+a)=k^2-2kr+r^2

a=k^2+r^2-2kr-p

choice 2