Evaluating Expressions

5m + 9n if m = -7 and n = 4

-7w² + 2w if w = -4

What is the value of the expression

x² + y² + x - y

when x = -1 and y = 3

g²-3(h-g)Evaluate if g=3 and h=-2

 $3\left(2x+z\right)\ \ ;\ when\ x=\ \frac{2}{3}\ and\ z=4$