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Simplify. Then evaluate each expression as directed. Find the value of 3x+5(x+9)-4x, when x=-5.

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Find the value of 3x+5(x+9)-4x, when x=-5.

Zebra from Los Angeles, CA 2/6/2013

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2 Answers

3x + 5(x+9) - 4x when x = -5

(substitute x with -5)

Here are the steps:

1. +3 times -5 = -15

2. +5 times -5 = -25

3. +5 times +9 = +45

4. -4 x -5 = +20

Then you add: -15 -25 +45 +20 = 25

example: -15-25= -40+45 = +5 +20 =25

Claudia H. 2/20/2013

3x+5(x+9)-4x = 3x+5x+45-4x = 8x+45-4x = 4x+45

Substitute x= -5

4*-5 + 45 = -20 + 45 = 25

Chaitra C. 2/6/2013