2

Question

2 <or= 7x+5 < 7,  olve the following inequality. Write the answer in interval notation. 
Note: If the answer includes more than one interval write the intervals separated by the "union" symbol, U. If needed enter  as infinity and  as -infinity .

aravindg · Answer

:) giv me medal

anonymous · Answer

i got -3/7, 2/7 but it says im wrong

zarkon · Answer

$$2\leq 7x+5<7$$
$$2-5\leq 7x<7-5$$
$$\frac{2-5}{7}\leq x<\frac{7-5}{7}$$
$$\frac{-3}{7}\leq x<\frac{2}{7}$$

anonymous · Answer

thats what i got but it says its incorrect, im think im suppose to us U or $$\infty$$ but im not sure how to use it

zarkon · Answer

that is the answer http://www.wolframalpha.com/input/?i=2+%3C%3D+7x%2B5+%3C+7&t=ietb01

zarkon · Answer

maybe write it like this ...
[-3/7,2/7)