we are given to simplify
[tex] \\
\
(x^6y^5)(5xy^2)(-6x^4)\\
\\ [/tex]
Open the bracket and write the like terms together
[tex] \\
\
=x^6y^5*5xy^2*(-6)x^4\\
\\
\
=-30x^6*x*x^4*y^5*y^2\\
\\ [/tex]
when the bases are same then the exponents gets added
[tex] \\
\
=-30x^{6+1+4}y^{2+5}\\
\\
\
=-30x^{11}y^7 [/tex]
