crissy126
anyone know the vertex formula?



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precal
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dw:1359309883413:dw

precal
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dw:1359309894668:dw

crissy126
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i can do the first part how do you do the second part?

precal
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once you find x, just sub x back into the original equation to find y

crissy126
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ok how would you if x=20
sub it into y= 0.0375x^ + 1.5x to =15

precal
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give me the original equation first

crissy126
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ok it is y=0.0375x^2+1.5x

precal
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dw:1359310208655:dwok your x is correct

precal
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dw:1359310292570:dw(20,15) is your vertex

precal
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you will use order of operation to evaluate it to become 15

crissy126
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do you only add the 20 to the 2nd x?

precal
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.0375(400)+30
15+30
15

precal
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use order of operations
Parenthesis
Exponents
Multiplication and division left to right
addition and subtraction left to right

crissy126
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ok thanks

precal
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yw

crissy126
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im doing a math project and i didnt get how to do a part and you helped me thx

precal
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anytime