How do you evaluate the expression for x = -2, y = 3, z = -4 given 7x - 2y - 8z?

1 Answer
H Dev
Apr 24, 2016

12

Explanation:

Substitute the numbers into its corresponding position.
#7(-2) - 2(3) - 8(-4)#

Now evaluate using PEMDAS (Remember that when multiplication and division are together evaluate from left to right. The same thing goes for addition and subtraction.)
#7(-2) - 2(3) - 8(-4)#
#= -14 - 2(3) - 8(-4)#
#= -14 - 6 - 8(-4)#
#= -14 - 6 + 32#
#= -20 + 32#
#=12#

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