SOLUTION: If {{{f(x)=1/2x^2-1/(3x+7)}}}, What is f(-3)?

Algebra ->  Numeric Fractions Calculators, Lesson and Practice -> SOLUTION: If {{{f(x)=1/2x^2-1/(3x+7)}}}, What is f(-3)?      Log On


   

Question 259921: If f%28x%29=1%2F2x%5E2-1%2F%283x%2B7%29, What is f(-3)?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
f(x)=1/2x^2-1/(3x+7)
plug -3 in for x
f%28-3%29=1%2F2%28-3%29%5E2-1%2F%283%28-3%29%2B7%29%29


f%28-3%29=1%2F18-1%2F%28-2%29%29
f%28-3%29=1%2F18%2B9%2F18%29
f%28-3%29=10%2F18%29
f%28-3%29=5%2F9%29