# Basic Algebra - Factorising

Discussion in 'Algebra' started by moonlighthunter, Mar 7, 2024.

1. ### moonlighthunter

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Hi,

The numerator is 9x^2 - 4. According to the exam board the correct answer is b = 4. I think b = 2.
What do you think?

moonlighthunter, Mar 7, 2024
2. ### HallsofIvy

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$ax^2- b^2= (x\sqrt{a}- b)(x\sqrt{a}+ b)$. That COULD be (3x- 2)(3x+ 2) with a= 9 and b= 2.

In order that $9x^2- 4$ reduce to 3x- 2, the denominator must have a factor of 3x+ 2 so must be --- $(3x+ 2)(4x- 1)= 12x^2 + 5x- 2$.

The fraction is $\frac{9x^2- 4}{12x^2+ 5x- 2}$ with a= 9, b= 4, c= 12, d= 5, and e= -2.

HallsofIvy, Mar 7, 2024
3. ### RobertSmart

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To factorize ax^2−b^2, we use the difference of squares formula:

ax^2−b^2=(x√a−b)(x√a+b).

Given that ax^2−b^2=9x2−4,

we identify a=9 and b=2.

This expression can be factored as (3x−2)(3x+2).

For 9x^2−4 to reduce to 3x−2, the denominator must contain a factor of 3x+2.

So, it should be of the form (3x+2)(4x−1)=12x^2+5x−2.

Thus, the fraction becomes 9x^2−4/12x^2+5x−2, where a=9, b=2, c=12, d=5, and e=−2.

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RobertSmart, May 2, 2024
4. ### moonlighthunter

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moonlighthunter, May 7, 2024
5. ### solo_guitar

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I hope you are doing great. I am considering a chapter by chapter, section by section review of College Algebra. The textbook I will be using is College Algebra by Michael Sullivan Edition 9, which you can free download by simply searching online.

Come along with me as I cover every chapter, every section in the Michael Sullivan Edition 9 textbook. It's going to be fun. We are going to learn so much from each other. Knowledge is power.

My name is Feliz. What is yours? So, are you going to take this ride with me through college algebra on our way to precalculus and finally calculus l, ll, and lll? You say?

Feliz

solo_guitar, Aug 24, 2024
6. ### conway

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Is this what you really want? Pretend for a moment you are the greatest mathematician to have ever lived. What is that next to the value of love?

conway, Aug 24, 2024
7. ### solo_guitar

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I give up. Take care of yourself. Blocking time.

solo_guitar, Aug 24, 2024
8. ### conway

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Lol be blessed

conway, Aug 24, 2024

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