Book Maths Puzzle Algebra

How do you work and grahph f(x)=^-x2 dividby 4. I need to work the inverse also
Thank you Carlene

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Book Other Question
If 9 is added to twice a number and this sum is multiplied by 3, the result is the same as if the number is multiplied by 4 and 13 is added to the product. What is the number?



I got a -7. But when I plugged the -7 back into the equation, it didn't work. What am I doing wrong?



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