## soccerbabe239 Group Title factor 4y^2-9 one year ago one year ago

1. ZeHanz Group Title

It is of the form a² - b² = (a + b)(a - b). Here: a² = 4y² and b² = 9. So if you can figure out a and b, you can factor it!

2. soccerbabe239 Group Title

would it be (4y+3)(4y-3) ?

3. whpalmer4 Group Title

Close, but not quite. 4*4 = 16.

4. whpalmer4 Group Title

$a^2 = 4y^2$Take square root of both sides $a=\sqrt{4y^2} = ?$

5. soccerbabe239 Group Title

oh haha so it would be (2y+3)(2y-3)

6. ZeHanz Group Title

Right!

7. whpalmer4 Group Title

By the way, learning to recognize difference of squares like this is an important trick in your bag of factoring tricks.

8. soccerbabe239 Group Title

okay! haha blonde moment! :)

9. ZeHanz Group Title

We all have that once in a while!

10. soccerbabe239 Group Title

haha this is my 6 th one today :/

11. whpalmer4 Group Title

And whenever you think you've solved something, or factored it, it's not a bad idea at all to expand it out or plug in the solution and make sure that your answer works!

12. ZeHanz Group Title

You used them up for the whole week already!

13. whpalmer4 Group Title

Might have to wear a wig for a few days ;-)

14. soccerbabe239 Group Title

haha thanks guys! and its natural I cant help it. and the wig wouldnt hide anything. honestly ive tried that and it didn't work:(

15. ZeHanz Group Title

Just learn to live with it ;)

16. soccerbabe239 Group Title

haha I do! I just accept im a natural blonde but at least im not a bimbo!

17. ZeHanz Group Title

Good luck with your maths problems!

18. whpalmer4 Group Title

I have a friend who is a natural brunette, but she prefers to be blonde, and often pulls it off quite convincingly :-)