SOLUTION: If f(x)=8x2 and r(x)=Sqrt(7x), find a simplified formula for f(r(x))..
I know this is somewhat like substitution, and I also know that I have to put r(x) into f(x). So, I di
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-> SOLUTION: If f(x)=8x2 and r(x)=Sqrt(7x), find a simplified formula for f(r(x))..
I know this is somewhat like substitution, and I also know that I have to put r(x) into f(x). So, I di
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Question 924260: If f(x)=8x2 and r(x)=Sqrt(7x), find a simplified formula for f(r(x))..
I know this is somewhat like substitution, and I also know that I have to put r(x) into f(x). So, I did 8(sqrt(7x))^2 but I don't know what to do next. Answer by jim_thompson5910(35256) (Show Source):
You can put this solution on YOUR website! Squaring is the opposite of square rooting, or vice versa. When you square a square root, the two go away because they cancel out.
So where . If x is allowed to be negative, then you have to use absolute value bars to say
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