## anonymous one year ago Which of the following is not equivalent to the rational expression when x not equal to 7 ? x^2-49/x-7 A. x-7 B. x+7/x-7 C. 1/x+7 D. x+7

1. misty1212

HI!!

2. misty1212

a rather strangely worded question, which you can interpret as "factor and cancel" does that help?

3. anonymous

not really because I suck at math honestly and hi haha

4. misty1212

lol ok lets do it then factor the top, which is $$x^2-49$$ the "difference of two squares" $a^2-b^2=(a+b)(a-b)$ always, so $x^2-49=(x+7)(x-7)$

5. anonymous

which of the following is equal to the rational expression when x not equal to 7............ I TYPED THE QUESTION WRONG!!!

6. misty1212

i knew that since 3 of them are NOT and only one of them IS

7. anonymous

yes... sorry

8. misty1212

since the numerator is $$(x+7)(x-7)$$ the entire fraction is $\frac{(x+7)(x-7)}{x-7}$ now cancel

9. anonymous

x+7?

10. misty1212

you know what i mean by that?

11. misty1212

yeah you get $$x+7$$

12. anonymous

thank you

13. misty1212

$\color\magenta\heartsuit$

14. anonymous

:)