SOLUTION: I cannot figure this out. I tried systems of equations, both substitution and elimination, but could not get it to solve. Thanks If cd=4 and C^2+d^2=10, what is (c+d)^2

Algebra ->  Systems-of-equations -> SOLUTION: I cannot figure this out. I tried systems of equations, both substitution and elimination, but could not get it to solve. Thanks If cd=4 and C^2+d^2=10, what is (c+d)^2      Log On


   

Question 142317: I cannot figure this out. I tried systems of equations, both substitution and elimination, but could not get it to solve. Thanks
If cd=4 and C^2+d^2=10, what is (c+d)^2
Answer by nabla(475) About Me  (Show Source):
You can put this solution on YOUR website!
%28c%2Bd%29%5E2=c%5E2%2B2cd%2Bd%5E2+
c%5E2%2Bd%5E2=10
cd=4 implies 2cd=8
now substitute:

c%5E2%2B2cd%2Bd%5E2=c%5E2%2Bd%5E2%2B2cd=10%2B8=18.