# ASSIGNMENT QUESTIONS- need help with algebra equations

1. Mar 11, 2012

### nat_94

i dont understand these equations and cant find a way to do them from my text book or any websites please help..

(a) √(2^2+2 x 2+1)

(b) -√(〖25〗^2-) 〖24〗^2

(c) (7x +y)^2 - (7x - y)^2

2. Mar 11, 2012

### HallsofIvy

Because this are "assignment questions", I am moving this to "homework and classwork".

3. Mar 11, 2012

### HallsofIvy

Do you know what $\sqrt{a^2}$ is?

This doesn't make much sense. What does $\sqrt{(25)^2-}$ mean?

surely it is not that hard to square? $(a+ b)^2= a^2+ 2ab+ b^2$.

4. Mar 11, 2012

### nat_94

sorry i typed the equations on word and copy andpasted them, they changed format.
i mean
(b) -√(25^2-24^2

5. Mar 11, 2012

### scurty

Can you rewrite part a? I don't understand what the equation is.

For part b) here is a clever hint: 25 = 24 + 1

For part c) use this property: $(a-b)(a+b)=a^{2}-b^{2}$. Can you figure out what to do from here?

Last edited: Mar 12, 2012