# Math Help - please help me with these problems.

1.For x2- 25 = 0, x=

2.Add and simplify: 5/6+1/4

3.Simplify the square root of 27 + the square root of 75.

4.solve:3xsquared-2x-2=0

5.Find N for log2N=3

6.Find N for logb32=5

thanks so much for your help!!!

2. Originally Posted by yellowjello
1.For x2- 25 = 0, x=

2.Add and simplify: 5/6+1/4

3.Simplify the square root of 27 + the square root of 75.

4.solve:3xsquared-2x-2=0

5.Find N for log2N=3

6.Find N for logb32=5

thanks so much for your help!!!
1) Factor. Difference of squares.
2) Common denominator.
3) Common factor. sqrt(27) = sqrt(3*9) = sqrt(3)*sqrt(9) ... Same thing with sqrt(75)
4) Factor or quadratic formula
5) Definition of logarithms.
6) Where's the N?

3. ## answer to #3

okay so i'm trying to factor #3
and i'm getting as far as (3x-2) (x-1) I know the signs are probably messed up and the 1 &2 are messed up, I know that the #'s that go in the spots of the 1 & 2 are supposed to multiply to equal -2 and add to equal the other -2 I just don't knwo how to get there. help?

4. ## quad form

yes i know the quad form where do i plug everything in? that i do not remember

5. Originally Posted by yellowjello
yes i know the quad form where do i plug everything in? that i do not remember
if you knew the formula, you would know where to plug everything in

the formula says the solution(s) for $ax^2 + bx + c = 0$ is/are given by

$x = \frac {-b \pm \sqrt{b^2 - 4ac}}{2a}$

now, what is a, b and c in your problem? then what would x be?

6. ## okay

yeah nevermind i just tried it, is it no solution?
that's what i'm getting...
as long as this is right that's the answer i'm getting
a=3
b=2
c=-2

7. Originally Posted by yellowjello
yeah nevermind i just tried it, is it no solution?
that's what i'm getting...
as long as this is right that's the answer i'm getting
a=3
b=2
c=-2
according to what you typed originally, b = -2. solutions exist in that case

8. I had b=-2...

so the top is set up as -2 plus or minus the sqrt of 2squared -4 (3)(-2)
and the bottom as 2(3)
is this right?

9. Originally Posted by yellowjello