SOLUTION: Hello: If someone can help, I am sooo stuck on this problem 3/5√x + x^3 if x = 16 Thank you, Lcarl

Algebra ->  Human-and-algebraic-language -> SOLUTION: Hello: If someone can help, I am sooo stuck on this problem 3/5√x + x^3 if x = 16 Thank you, Lcarl      Log On


   

Question 203210: Hello:
If someone can help, I am sooo stuck on this problem
3/5√x + x^3 if x = 16
Thank you,
Lcarl
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Is the expression %283%2F5%29%2Asqrt%28x%29%2Bx%5E3 ???? If so, then...


%283%2F5%29%2Asqrt%28x%29%2Bx%5E3 Start with the given expression.


%283%2F5%29%2Asqrt%2816%29%2B%2816%29%5E3 Plug in x=16


%283%2F5%29%2A4%2B%2816%29%5E3 Take the square root of 16 to get 4


%283%2F5%29%2A4%2B4096 Cube 16 to get 4096


12%2F5%2B4096 Multiply


12%2F5%2B4096%285%2F5%29 Multiply the second term 4096 by 5%2F5 (to get the denominator equal to 5)


12%2F5%2B20480%2F5 Multiply


%2812%2B20480%29%2F5 Combine the fractions.


20492%2F5 Add


So %283%2F5%29%2Asqrt%28x%29%2Bx%5E3=20492%2F5 when x=16