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## ninashabrang Group Title Solve 2x2 - 8x = -7. I just want to know if my answer is correct. I got x=2+- 2 sqr 2 one year ago one year ago

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1. swissgirl

$$2x^2-8x+7=0$$ $$A=2, B=-8, C=7$$ $$\large \frac{-(-8) \pm \sqrt{(-8)^2-4(2)(7)}}{2(2)}$$ $$\large \frac{8 \pm \sqrt{64-56}}{4}$$ $$\large \frac{8 \pm \sqrt{8}}{4}$$ $$\large \frac{8 \pm 2\sqrt{2}}{4}$$ $$\large \frac{4\pm \sqrt{2}}{2}$$ OR $$\large 2\frac{\pm \sqrt{2}}{2}$$

2. swissgirl

hmmm are you sure this is the right equation?

3. ninashabrang

oh sorry these are the answer choices: negative 2 plus or minus square root of 2 negative 2 plus or minus 2 square root of 2 quantity of 2 plus or minus square root of 2 all over 2 2 plus or minus square root of 2 end root over 2

4. swissgirl

So what do you think?

5. ninashabrang

im not sure I cant understand what you typed up there..haha

6. swissgirl

So how did you get your answer?

7. ninashabrang

my own answer is x=2+-2 sqr 2

8. swissgirl

How did you get that?

9. ninashabrang

its long in my notebook haha I just need to know if my answer is correct or not

10. swissgirl

Your answer is incorrect

11. swissgirl

Look at my answer above

12. ninashabrang

OH it shows now! thanks! ill review it and find my mistake!

13. swissgirl

$$\large 2 \pm \frac{\sqrt{2}}{2}$$

14. ninashabrang

Thanks!