Homework Help: Math

Posted by Hannah on Saturday, April 2, 2011 at 7:20pm.

if f(x) = 2x^2 + 5x,
find f(x+h) - f(x) / h and simplify.

I started to do this but then got lost.
2(x+h)^2 + 5x + 2x^2 + 5x all over h

4x^2 + 4xh + h^2 + 5x + 2x^2 + 5x

Math - Damon, Saturday, April 2, 2011 at 7:35pm
2[x^2 + 2 x h + h^2] + 5x + 5 h

2 x^2 +4 xh + 2 h^2 + 5 x + 5 h
-2x^2 -5x

= 4 x h + 2 h^2 + 5 h

divide by h
4 x +2 h + 5

check - limit as h--> 0 should be derivative
4 x^2 + 5 yes check
Math - Hannah, Saturday, April 2, 2011 at 10:29pm
Well the answer choices were
1) 4x + 5xh + h^2 + 5h
2) 4x + 5h + 4h^2
3) 4x + 5 + 4h^2 + 5h
4) None of the above

So the answer is none of the above correct?
Math - Hannah, Saturday, April 2, 2011 at 10:44pm
The answer is 4x^2 + 5 correct?

Answer this Question

Related Questions

Math33333 - Please help me! Problem: x+2 x-3 _________ - _________ 2x^2+5x+2 2x^...
bobPursley2...the other one - Problem 2: (x+2)/(2x^2+5x+2) - (x-3)/(2x^2-5x-3) ...
algebra - Will someone please look over these? I am so lost on these. 1. find ...
Intermediate Algebra - Am I going in the right track? 8x -1/x + 5x - 3/2x = 16x^...
MAth - Simplify: 2x-(3x+8+2(3-5x)) I got 9x -14... is that right?
Math correct - Subtract.. (8x^4+5x^3-6)-(2x^2-2x+6) I got 8x^4+5x-2x^2+2x-12 ...
Math - Perform the indicated operation and simplify. 2x+3/5x - 2x-2/5x
Function compostions - Sorry I had to repost, I left somethings out. Can you ...
Math - Find the quotient and simplify your answer. f(x)=5x-x^2, f(5+h)-f(5) over...
Algebra - Could you please check my work. Determine whether the realtion is a ...

For Further Reading

First Name:
School Subject:
Answer: