Question

Help Please

Answer 1

Correct answer is A.

$(x^2+4x-3)(2x^2+x+6) \\=x^2(2x^2+x+6)+4x(2x^2+x+6)-3(2x^2+x+6) \\=2x^4+x^3+6x^2+8x^3+4x^2+24x-6x^2-3x-18 \\=2x^4+x^3+8x^3+6x^2+4x^2-6x^2+24x-3x-18 \\=2x^4+9x^3+4x^2+21x-18$