Solve the equation by graphing: x2 + 5x + 8 = 0.
A. {-5, 8}
B. {2, 4}
C. {-4, 5}
D. No solution

Question

Solve the equation by graphing: x2 + 5x + 8 = 0.
	A.	{-5, 8}
	B.	{2, 4}
	C.	{-4, 5}
	D.	No solution

shayaan_mustafa · Answer

this method is long to solve AlexisDelgado.

shayaan_mustafa · Answer

you have to make a set of some points in order to plot the equations on the graph.
I thin directrix is solving it for you.

directrix · Answer

There are two solutions but they are not real. I assume that you are solving over the set of Reals. In that case, of the options, I would choose D. No solution --> Ans Look at the graph: http://www.wolframalpha.com/input/?i=x%5E2+%2B+5x+%2B+8+%3D+0

shayaan_mustafa · Answer

answer is D

directrix · Answer

Note: Nobody solves Quadratics by hand these days. To be honest, solving "by graphing" is an achingly trendy but somewhat bogus topic. The basic idea behind solving by graphing is that, since the "solutions" to "ax2 + bx + c = 0" are the x-intercepts of "y = ax2 + bx + c", you can look at the x-intercepts of the graph to find the solutions to the equation. There are difficulties with "solving" this way, though.... http://www.purplemath.com/modules/solvquad5.htm

shayaan_mustafa · Answer

also. only a linear equation never gives any solution alone.

shayaan_mustafa · Answer

@Directrix 
i agree with you.

anonymous · Answer

how would i put this information into a graphing calculator ?

shayaan_mustafa · Answer

you should use manual which came up with your graphing calculator.