# MATH STUCK:-(

posted by .

I am having some difficulties factoring polynomials and I use only one method to figure the stuff out, which is the guess and check method because it's just mental math work and not that complicating.

Here is a question that I know how to do, and below it I will list down the question that I do not know how to solve, and would like if you could solve it for me the way I solved the question above.

Factor:

2x(x+5)-3(x+5)
=2x^2+10x-3x-15
=2x^2+7x-15

Product=-15

(2x-5)(x+3)not this one

(2x+3)(x-5)not this one either

(2x-3)(x+5) this one is right

{So I basically used the guess and check method above after combining the like terms}

Now this is the question that left me puzzled. I would appreciate if you could solve it like the way I have done above with a simpler version.

9x^2+12xy+4y^2

{usually there is a constant in a polynomial, but this one doesn't have one, so I am cofused on what to do}

• MATH STUCK:-( -

2x(x+5)-3(x+5)
Note that (x+5) is a common factor.
So
2x(x+5)-3(x+5)
=(x+5)(2x-3)

9x^2+12xy+4y^2
with the guess and check method, you can try to see if it is a perfect square:
√(9x²)=3x
√(4y²)=2y
So try
(3x+2y)²

• MATH STUCK:-( -

That works out perfectly. Thank you very much MathMate.

## Similar Questions

1. ### Physics

*I am lost on a bunch of different problems, and this is one of them. Please note that I am NOT asking for final answers, just some guidance so that I can figure out how to do the problem!!! I know that a lot of times on this site …
2. ### MATH

Useing substitution/elimination method what is the solution set to 2x+y=1 x^2=y+2 a)(-3,7) and (1,-1) b)(3,7) and (-1,-1) c)(-3,-7) and (1,1) d)(3,-7) and (-1,1) I've really no educated guess so PLEASE HELP! You can make an educated …
3. ### algebra,math

My qustion is for the following the problem reads as follows (x-1)^2 = 7 x-1=+- sqrt 7 x= 1+- sqrt 7 the method they use was factoring in order to simplify the equation to make it easier is this correc?
4. ### history

can some one check my work? i can where is it It's the one with the one that says order the sequence. Hi! brie. My work is on the 2nd page. Count the BLACK dots next to everybody's name until you find the 35th dot. Check that work.
5. ### algebra

which method do you use to solve this equation.(x-1)^2=7. Is it the factoring method or the sqare root method I would take the square root of each side. (x-1)= +- sqrt7 Now for the factoring method: (x-1)^2=7 (x-1)^2-7=0 you have a …
6. ### math

I'm having trouble trying to identify which method is best to use for graphing when faced with an equation. Are there certain things that I need to look out for that would indicate if it were best to use the table of values, slope-intercept …
7. ### College Math II

Solve by any method. x(x + 1) = 12 I am not sure what method to use to show my work and figure out the answer. Can someone help me understand this problem. Thanks.
8. ### Calculus

How can i factor x^3 - 3x^2 + x -4? I tried the factor theorem method, but it doesnt work. Is there another method for factoring cubic equation?
9. ### algebra 2

I'm stuck on this one: factoring polynomials from algebraic expressions (and it says you can use the substitution method): 3m^2(2p^2+3)over (x^2+y)(2x-y^2) minus 6m(2p^2+3)over (y^2-x)(2x-y^2)= Do I find the GCF?
10. ### MATH

USE THE AC METHOD FACTORING 9+^2+5+-4 CAN SOME ONE SHOW ME THE STEP TO SOLVING THIS PROBLEM

More Similar Questions