Question

please solve question number 4 all the parts

Answer 1

1) (5a-8b)(3a+12b)=
=15a^2+20ab-24ab-96b^2
=15a^2-4ab-96b^2 answer

2) (6x^2+11x-3)(2x-5)
=12x^3+22x^2-6x-5x^2-55x+15
=12x^3+17x^2-61x+15 answer