## anonymous one year ago How to factor 2x^2 - 1

1. pooja195

2. anonymous

Ok so 2x^2 - 1 has solutions 2x^2 = 1 2x^2 = 1/2 sqr(x^2) = sqr(1/2) ok I am stuck here to finding the solutions

3. pooja195

Thats not right .-. if you were to sqrt the 2 and then you'd be left with $(\sqrt{2}+1)(\sqrt{2}-1)$ diffrence of squares .-.

4. anonymous

How do I get the solutions ?

5. pooja195

Sqrt both numbers since its the difference of 2 squares ._.

6. pooja195

a^2-b^2=(a+b)(a-b) a=sqrt(2)x b=1

7. anonymous

Ah ok I see now. Thank you.

8. pooja195

$(\sqrt{2}x+1)(\sqrt{2}x−1)$

9. pooja195

im sorry i meant that ^

10. anonymous

I got it. Thank you!

11. pooja195

:) oh and this part too a^2-b^2 =$$(\sqrt2 x)^2-1^2=2x^2-1$$

12. pooja195

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13. anonymous

TY