Find the value of the following expressions if a=4 and b=-2.

a) 3ab-4b+5

b) (5a-2b)/(4ab-8)

(1). 3ab - 4b + 5 = 3(4)(-2) - 4(-2) + 5                                  = -24 + 8 + 5                                  = -24 + 13 = -11(2). 5a - 2b4ab - 8 = 5(4) - 2(-2)4 (4) (-2) - 8 = 20 + 4-32 - 8 = 24-40 = -2440 = - 35

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