solve y = -0.2x^2 + 4.8x -10.8 using the quadratic formula

Question

anonymous · Answer

$$-4.8\pm \sqrt{4.8^2-4(0.2)(-10.8)} \over (2)(0.2)$$

you should be able to solve it from there

anonymous · Answer

oops made a mistake. make the 0.2 with negatives

anonymous · Answer

yeah i did but I get 12√14.4   and I know that is not the right answer

anonymous · Answer

okay well Ill check the answer and see what it is. give me a minute

anonymous · Answer

ok thank you

anonymous · Answer

-12 +/- (sqrt(14.4)/.4)

anonymous · Answer

-12 +/- 9.4868...

anonymous · Answer

so you would just sqrt the 14.4?

anonymous · Answer

yea. for future reference,  sqrt (x) = x^(1/2)

anonymous · Answer

makes it easier to put in cheap calcs

anonymous · Answer

Ok so you would square root it instead?

anonymous · Answer

yes sqrt the 14.4 then divide that by the .4 then add it to or subtract it from the -12

anonymous · Answer

Thank you very much :) so I dont have to simplify the radical into other radicals right?

anonymous · Answer

not if you are straight out solving. it was already a decimal. to clean that up with radicals you would have to turn it into a fraction....