Evaluate the following when a = 4 and b = 7 :
\[(a+b)^2 - (a^2 + b^2).\]
Well, work it out.
(4 + 7)2 – (42 + 72)
121 – (16 + 49) = 121 – 65 = 56
.
Nice job, that looks right.
+153 
