Question

Expand and simplify the polynomial: (2x^3)(5x^4)

Answer 1

(2x^3)(5x^4)
= (2*5)(x^3*x^4)
= 10x^7

Answer 2

Remember, (ab)(cd)=(a)(b)(c)(d), so we can expand
also
$(x^m)(x^n)=x^{m+n}$

so

$(2x^3)(5x^4)=(2)(x^3)(5)(x^4)=(2)(5)(x^3)(x^4)=(10)(x^{3+4})=10x^7$