SOLUTION: f(x)=4x2-3x+2 f(-30)= NEED CALCULATIONS STEP BY STEP f=(30)= NEED CALCULATIONS STEP BY STEP Very confused - need help - please!!!

Algebra ->  Rational-functions -> SOLUTION: f(x)=4x2-3x+2 f(-30)= NEED CALCULATIONS STEP BY STEP f=(30)= NEED CALCULATIONS STEP BY STEP Very confused - need help - please!!!      Log On


   

Question 87889: f(x)=4x2-3x+2
f(-30)= NEED CALCULATIONS STEP BY STEP
f=(30)= NEED CALCULATIONS STEP BY STEP
Very confused - need help - please!!!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
#1
f%28x%29=4x%5E2-3x%2B2 Start with the given polynomial


f%28-30%29=4%28-30%29%5E2-3%28-30%29%2B2 Plug in x=-30


f%28-30%29=4%28900%29-3%28-30%29%2B2 Raise -30 to the second power to get 900


f%28-30%29=3600-3%28-30%29%2B2 Multiply 4 by 900 to get 3600


f%28-30%29=3600--90%2B2 Multiply 3 by -30 to get -90


f%28-30%29=3692 Now combine like terms
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#2
f%28x%29=4x%5E2-3x%2B2 Start with the given polynomial


f%2830%29=4%2830%29%5E2-3%2830%29%2B2 Plug in x=30


f%2830%29=4%28900%29-3%2830%29%2B2 Raise 30 to the second power to get 900


f%2830%29=3600-3%2830%29%2B2 Multiply 4 by 900 to get 3600


f%2830%29=3600-90%2B2 Multiply 3 by 30 to get 90


f%2830%29=3512 Now combine like terms