Question 1098319
Usually, we write exponents following a ^ symbol.
Write {{{x^2}}} as x^2 , {{{x^3}}} as x^3 and {{{sqrt(2)}}} as sqrt(2),
and people will know what you mean.
 
You probably mean
{{{f(x)=(x^2+2x)(x-3)}}}
 
Factorinng further the {{{x^2+2x=x(x+2)}}} factor,
you can re-write the fucntion as
{{{f(x)=x(x+2)(x-3)}}}
When one of those three factors is zero, {{{f(x)=0}}} ,
so the zeros of the function are
{{{highlight(x=0)}}} ,
{{{x+2=0}}} <--> {{{highlight(x=-2)}}} , and
{{{x-3=0}}} <--> {{{highlight(x=3)}}} .
 
Doing the indicated multiplication,
{{{f(x)=(x^2+2x)(x-3)}}} can be re-written as {{{f(x)=x^3-3x^2+2x^2-6x}}} ,
and "collecting like terms, we simplify it to
{{{f(x)=x^3-x^2-6x}}}
The leading coefficient is the number part of the term of highest degree.
That is the implied/invisible {{{highlight(1)}}} in front of {{{x^3}}} .
The degree is the greatest exponent: the {{{highlight(3)}}} in {{{x^3}}} .