Question

Can you factor this: y=-0.2x^2 + 4.8x - 10.8

I need an explanation to why I cant use the factoring method for this equation. Please help me out.

Answer 1

-2x2 +48x -108=0 divide by -2

x2 -24x +54 =0

Answer 2

@jhonyy9 but they are in decimals

Answer 3

Yes, just distribute out -0.2 from the eqtn. in order to have just one x^2. This gives you

-0.2(x^2 - 24x + 54)

from this point you should see that you are unable to figure out two numbers that would add up to -24 and multiply to 54. Therefore, you can't use the factoring method.

Answer 4

Thank you very much :D