Posted by **REALLY NEED HELP!!!!** on Friday, November 12, 2010 at 7:02pm.

Estimate the area under the graph of f(x)=x^2+2x from x = 4 to x = 10 using 3 approximating rectangles and left endpoints.

I got 290.25 as my answer but it's wrong. Would someone explain to me how to answer this question.

- Math: Calculus -
**bobpursley**, Friday, November 12, 2010 at 8:03pm
what is f(x) at x=4,6, 8

area=f(4)*2+f(6)*2 + f(8)*2

that is three rectangles of width 2, height to f(x)(left end point).

How in the world would you estimate to five digits of precision. "estimate"

f(4)=24

f(6)=48

f(8)=80

estimate: you do it. Twice the sum of those numbers.

## Answer This Question

## Related Questions

- Calculus - a) Estimate the area under the graph of f(x)=7+4x^2 from x=-1 to x=2...
- Calculus Help Please Urgent!!! - a) Estimate the area under the graph of f(x)=7+...
- Calculus - Estimate the area under the graph of f(x) = 2x^3 + 3 from x= -1 to x=...
- Math: Calculus - Estimate the area under the graph of f(x)=3x^3+5 from x=-1 to x...
- Calculus - Estimate the area under the graph of f(x)= x^2 + 2 x from x=1 to x=5 ...
- Calc - Estimate the area under the graph of f(x)= x^2 + 2 x from x=4 to x=10 ...
- Calculus-Approximate areas - Estimate the area under the graph of f(x)= x^2 + 3 ...
- calc - a) Estimate the area under the graph of f(x) = 10(sqrt(x)) from x = 0 to ...
- Calculus - Set up a Riemann sum to estimate the area under the graph of f(x) = ...
- Calculus - Question Details: Do the following. (Round your answers to four ...

More Related Questions