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anyone know the vertex formula?

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i can do the first part how do you do the second part?

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Other answers:

once you find x, just sub x back into the original equation to find y
ok how would you if x=20 sub it into y= -0.0375x^ + 1.5x to =15
give me the original equation first
ok it is y=-0.0375x^2+1.5x
|dw:1359310208655:dw|ok your x is correct
|dw:1359310292570:dw|(20,15) is your vertex
you will use order of operation to evaluate it to become 15
do you only add the 20 to the 2nd x?
-.0375(400)+30 -15+30 15
use order of operations Parenthesis Exponents Multiplication and division left to right addition and subtraction left to right
ok thanks
im doing a math project and i didnt get how to do a part and you helped me thx

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