Evaluating Expressions

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

• 71

• 1

• -1

• -71

x² - xy if x = 8 and y = -3

• 88

• 40

• -8

• -24

(18 - ab) + 4b if a = -2 and b = -5

• 8

• 28

• 48

• -12

-7w² + 2w if w = -4

• 104

• -64

• -120

• 120

½(10p - 7q) if p = 9 and q = 2

• 31

• 38

• 52

• 152

12x ÷ 4y if x = -8 and y = 3

• -8

• 72

• -72

• 8

k⁴ - 7k² if k = 3

• -9

• -51

• 60

• 18

10c - cd + d³ if c = -6 and d = 2

• -40

• 56

• 54

• -64

(12xy)/(x - y) if x = 3 and y = -1

• 9

• -18

• 18

• -9

(20ab) ÷ (a-b)² if a = 4 and b = -2

• 40/3

• 40

• -40/9

• -13