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Math Help Evaluate 4r-4 when r=3 I'm not sure how to work this out, please show me in steps

Math Help Evaluate 4r-4 when r=3 I'm not sure how to work this out, please show me in steps
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2 votes
Math Help

Evaluate
4r-4 when r=3

I'm not sure how to work this out, please show me in steps

User Karadoc
by
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1 Answer

3 votes
4r-4
4(3)-4
4 multiplied by 3 subtracted by 4
4(3) = 12-4
12 + (-4)
the subtraction changes to addition making the 4 negative.
12 + (-4) = positive 8.
I'm not positive this is 100% correct though.
User Webdesigner
by
8.3k points
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