Tbelow are a number of means to strategy this.One of the a lot of reliable is to hope that the expression has actually rational roots and apply the Rational Root Theorem.

You are watching: X^3-6x^2+11x-6

In this case, the Rational Root Theorem tells us that (if the expression has actually rational roots) those roots are integer components of #6# (the continuous term of the expression).

We have the right to construct a table/spreadsheet to evaluate the expression for these feasible factors:

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Note that as soon as #x=-1 or x=-2 or x=-3# then the expression has a worth of #0#.

Remember that if an expression has actually a worth of #0# once #x=a#then #(x-a)# must be a variable of the expression.

Because of this, we have three factors for the given expression:#color(white)("XXX")(x-(-1))(x-(-2))(x-(-3))##color(white)("XXXXsXXXXXXXXXXXXXXXX")=(x+1)(x+2)(x+3)#

Since the provided expression is of level #3#, it has at many #3# determinants and also we have uncovered them all.


Answer link

George C.
Aug 7, 2017

#x^3+6x^2+11x+6 = (x+1)(x+2)(x+3)#


Explanation:

Given:

#x^3+6x^2+11x+6#

You are actually most likely to enrespond to this pattern of coefficients #1, 6, 11, 6# often.

For illustration purposes, let us view what happens if we start by using a standard technique supplied as soon as resolving a general cubic:

#color(white)()#Tschirnhaus transformation

In order to simplify any type of cubic of the form #ax^3+bx^2+cx+d# we deserve to apply a linear substitution #t = x+b/(3a)# to provide a cubic in the create #at^3+et+f# through no quadratic term. This is the most basic develop of Tschirnhaus transformation.

In our example, #a=1# and also #b=6#, so we desire #t=x+2#.

Keep in mind that:

#(x+2)^3 = x^3+6x^2+12x+8#

So we find:

#x^3+6x^2+11x+6 = (x+2)^3-(x+2)#

#color(white)(x^3+6x^2+11x+6) = t^3-t#

#color(white)(x^3+6x^2+11x+6) = t(t^2-1)#

#color(white)(x^3+6x^2+11x+6) = t(t-1)(t+1)#

#color(white)(x^3+6x^2+11x+6) = (x+2)(x+1)(x+3)#

In even more judicious order:

#x^3+6x^2+11x+6 = (x+1)(x+2)(x+3)#


Answer attach

George C.
Sep 17, 2017

#x^3+6x^2+11x+6 = (x+1)(x+2)(x+3)#


Explanation:

It"s most likely worth stating that there"s an additional method to resolve this factoring difficulty if you have a calculator handy.

Given:

#x^3+6x^2+11x+6#

Because all of the coefficients of this polynomial are positive, we gain a basic to calculate number if we put #x=100#, namely:

#color(red)(1)(color(blue)(100))^3+color(purple)(6)(color(blue)(100))^2+color(brown)(11)(color(blue)(100))+color(green)(6) = color(red)(1)color(purple)(06)color(brown)(11)color(green)(06)#

That is, the number formed by composing 2 digits for each coefficient (apart from the leading one, which does not require even more than #1# digit).

Then factors of the create #(x+k)# correspond to integer determinants via digits "#10k#".

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So we can attempt separating #1061106# by miscellaneous numbers to view if we gain totality results.

The rational root theorem deserve to be used prior to that to let us know that the only feasible rational zeros are: