Question 448578
Please only post one problem at a time. I'll do the first two to get you started.


# 1

{{{3r^7 - 192r^4}}}



{{{3r^4(r^3 - 64)}}}



{{{3r^4(r-4)(r^2+4r+16)}}}



So {{{3r^7 - 192r^4=3r^4(r-4)(r^2+4r+16)}}}


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# 2


{{{3x^3- 27x^2 - 4x + 36}}}



{{{(3x^3- 27x^2)+( - 4x + 36)}}}



{{{3x^2(x- 9)-4(x-9)}}}



{{{(3x^2-4)(x-9)}}}



So {{{3x^3- 27x^2 - 4x + 36=(3x^2-4)(x-9)}}}