Help please :)
(I'm supposed to solve this using a graphical approach)
Use this graph to solve the following equations
x3-4x2=2x-8

Question

Help please :)
(I'm supposed to solve this using a graphical approach)
Use this graph to solve the following equations 
x3-4x2=2x-8

wcrmelissa2001 · Answer

attachment

wcrmelissa2001 · Answer

oh wait sorry the equation of the graph im supposed to use is y=x3-4x2+3x+4

phi · Answer

what is the equation of the plotted curve ?

wcrmelissa2001 · Answer

y=x3-4x2+3x+4 im supposed to use that to solve x3-4x2=2x-8

phi · Answer

so you have
$$ y=x^3-4x^2 +3x + 4$$
and you want to solve
$$ x^3-4x^2=2x-8$$
?

wcrmelissa2001 · Answer

yeah based on the graph or smth

phi · Answer

rewrite your equation as
$$ x^3 -4x^2 -2x +8=0 $$

wcrmelissa2001 · Answer

like e.g. the previous questions were easier like solve x3-4x2+3x=0

phi · Answer

if we add 5x-4 to both sides  we get
$$ x^3 -4x^2 +3x +4 = 5x-4$$

wcrmelissa2001 · Answer

oh

phi · Answer

if I did that correctly, the left-hand side is your graph.
and we have to find where the line 5x-4 intersects it

wcrmelissa2001 · Answer

oh i see. thanks :D

phi · Answer

by eyeball, it looks like the answer is
x is about 1.4

wcrmelissa2001 · Answer

about there :D thanks!!!!