The answer can either be $\displaystyle -1.37 $ or $\displaystyle 1.37 $. Thats what the $\displaystyle \pm $ sign means. $\displaystyle 1.37 $ is approximately the square root of $\displaystyle 1.89 $.
lol i hate to keep bothering you but could you help me with one last one?
im reviewing for an exam here and this stuff has completely flown out of my head.
7x^3+23x+6=0
now for this i would use the zero product property right?
could you please give me one last demonstration?
thanks budd
Yeah, its probably a typo. I even plugged in the equation into Maple, and the answer was very long and complicated. So I bet it is a typo.
So if the equation is $\displaystyle 7x^{2} + 23x + 6 = 0 $ then you have to factor it.
You get: $\displaystyle (x+3)(7x+2) = 0 $
Using the zero product property, $\displaystyle x + 3 = 0 $ or $\displaystyle 7x+2 = 0 $. Then $\displaystyle x = -3 \; \text{or} \; x = -\frac{2}{7} $.
You could also solve this using the quadratic formula. But this is easier.