I need some help with this problem

-6

Step-by-step explanation:

First you need to substitute -1 in for x in -2x^2

This makes it (-2)(-1)^2

-2x^2 becomes -2 so this means that the equation is now

-2 + (-1) - 3

-2 + (-1) = -3

-3 - 3 = -6

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

idk wbu

step-by-step explanation: