# I want check my answer ()()()

1. Oct 11, 2009

### r-soy

I want check my answer ()()()

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2. Oct 11, 2009

### HallsofIvy

Staff Emeritus
For 59 you have "- x3" when you should be subtracting the square.

For 60 you have "$\sqrt{x}+ \sqrt{x}+ \sqrt{x}$" for "add three times the square root". That will work but should be written more simply as "$3\sqrt{x}$".

The others are correct.

3. Oct 11, 2009

### r-soy

my dear

#59 what is wrong ?

# 60
F(x) = -8xccube + 3square root of 3

now is ok?

4. Oct 11, 2009

### Staff: Mentor

#59 "subtracts the square of the domain element", not the cube of it, as you have.
#60 Correct. F(x) = -8x3 + 3$\sqrt{3}$

5. Oct 11, 2009

### Mentallic

In #59 the question says "...then subtract the square of the domain element..." (maybe the underline is the key here )
But you have subtracted the cube.
the square ---> x2
the cube ----> x3

See the dilemma?

For #60 yes that is ok now.

6. Oct 11, 2009

### r-soy

thanks very much for helping me