Medium
If a=2 and b=-3, find the value of a squared - ab + b squared.
Explanation
Explanation
a squared = 2 squared = 4. ab = 2 x (-3) = -6. b squared = (-3) squared = 9. So a squared - ab + b squared = 4 - (-6) + 9 = 4 + 6 + 9 = 19.
PRO TIP
Re-check your working by substituting the answer back into the original question.