What is the value of x? the figure shows 2 right triangles, triangle k l j with right angle j and triangle l j m with right angle m. the measure of angle l k j is 30 degrees. the measure of angle l j m is 45 degrees. the length of side k l is 8 square root 2. the length of side l m is x. enter your answer in the box. x =

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

i would say c is the best answer, hope it's right!

good luck! =)

cutie~