Posted by **Sarah** on Sunday, January 21, 2007 at 9:20pm.

I have a few match problems that I can't figure out.

1.solve: 3x+5=x√7 (that's a radical sign)

2.factor: (2k+3)2-(2x+3)(y-2)-20(y-2)2 (the "2" after (2k+3) ans (y-2) is suppose to be a square sign.

thanks if you can help, or even if you can't

For number 2:

First, FOIL out (2k+3)^2. You should get:

4k^2 + 12k + 9.

Then, FOIL out (2x+3)(y-2). You should get:

2xy - 4x + 3y - 6. You wanted to subtract the first part by the second:

4k^2 + 12k + 9 -(2xy - 4x + 3y - 6).

Distribute the negative:

4k^2 + 12k + 9 - 2xy + 4x - 3y + 6.

Combine like-terms:

4k^2 + 12k - 2xy + 4x - 3y + 15.

Before multiplying 20 by (y-2)^2, FOIL out the (y-2)^2. You should get:

y^2 - 4y + 4.

Now multiply by 20:

20y^2 - 80y + 80.

Now, take the equation from 6 lines up and subtract by this part:

4k^2 + 12k - 2xy + 4x - 3y + 15 -(20y^2 - 80y + 80).

Distribute the negative:

4k^2 + 12k - 2xy + 4x - 3y + 15 - 20y^2 + 80y - 80.

Now, combine like-terms to finish:

4k^2 + 12k - 2xy + 4x + 77y - 20y^2 - 65.

## Answer This Question

## Related Questions

- Match please - I have a few match problems that I can't figure out. 1.solve: 3x+...
- math , help,algebra - i am up to this point in my problem but i don't know what ...
- Alg 1 - Solve the proportion: 4/x = (radical sign over 11, not -1) 11 - 1/3 ...
- Algebra - 1.Simplify the radical expression. √5+6√√5 A.5√...
- algebra 1 - alright i have a few questions if its ok..? Simplify: 1. -2√(...
- Math integral - What is the integral of 1/(x√(x^2-4)) dx? So I know that I...
- maths - A hockey match is played from 3 p.m. to 5 p.m. A man arrives late for ...
- 8th grade algebra: radicals - please help me solve these 1. 2√5/8 + 4&#...
- Math ( composite functions ) - I need some help with composite functions where ...
- Math - Okay .. did you see my last answer? I think it is 5 But now I have ...

More Related Questions