ASSIGNMENT QUESTIONS- with algebra equations

[nat_94]

i don't understand these equations and can't find a way to do them from my textbook or any websites please help..

(a) √(2^2+2 x 2+1)

(b) -√(〖25〗^2-) 〖24〗^2

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

 

[HallsofIvy]

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

 

[HallsofIvy]

i don't understand these equations and can't find a way to do them from my textbook or any websites please help..

(a) √(2^2+2 x 2+1)

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

(b) -√(〖25〗^2-) 〖24〗^2

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

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

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

 

[nat_94]

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

 

[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?