Question

if c^2 + d^2 = 20 and cd = 10, what is the value of (c + d)^2?

Answer 1

here's a hint:
\[\Large (c+d)^2 \implies (c+d)(c+d) \implies c^2 + cd + cd + d^2\]
\[\Large \implies c^2 + 2cd + d^2\]
does that help?

Answer 2

yep, thanks

Answer 3

welcome