Question 745163
Use the idea that


(a+b)(c+d) = a(c+d) + b(c+d)


to get this:


(6q + 5r)(7q - 12r) 


6q(7q - 12r) + 5r(7q - 12r) 


6q(7q) + 6q(-12r) + 5r(7q) + 5r(-12r) 


42q^2 - 72rq + 35rq - 60r^2


42q^2 + (-72rq + 35rq) - 60r^2


42q^2 + (-72 + 35)rq - 60r^2


42q^2 - 37rq - 60r^2


Final Answer: 42q^2 - 37rq - 60r^2