Question

0=x^3+2x-3, solve for x. this looks impossible

Answer 1

3=x^3+2x

Answer 2

so is this just guess and check? lol

Answer 3

you can get approximate roots by drawing a graph
then more accurate ones by method of trial and improvement

Answer 4

so cwrw, its just guess and check?

Answer 5

actually by observation one root is x=1

Answer 6

yeah i know the answer is 1, but i want to know the method

Answer 7

sorry

Answer 8

as i say drawing a graph would help - there may be other roots not just 1

Answer 9

so is this this the way to solve it for equations like: ax^3+bx+c?

Answer 10

=0?

Answer 11

its one way - there may be others
trial and improvement is a valid way but can be tedious
if you know from the graph that root lies between 1 and 2 say
you try 2.1, 2.2 etc until you get f(x) passing through 0

Answer 12

SMISHRA - r u from eastern europe?

Answer 13

Do you know Cardan's Solution.

Answer 14

no - never heard of it

Answer 15

i drew a rough graph - theres only 1 solution (1)