What is the correct expansion of (3x-2)(2x^2+5)

asked Apr 24, 2018 115k views

4 votes

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6 votes

foil or whatever
just multiply

remember
(a-b)(c+d)=ac-bc+ad-bd
and

(ax^m)(bx^n)=(a)(x^m)(b)(x^n)=abx^(m+n)

so

(3x-2)(2x²+5)=
(3x)(2x²)+(-2)(2x²)+(3x)(5)+(-2)(5)=
6x³-4x²+15x-10

Oktav answered Apr 27, 2018

by Oktav

8.5k points

1 vote

3x*2x^2=6x^3
3x*5=15x
-2*2x^2=-4x^2
-2*5=-10
6x^3+15x-4x^2-10=
6x^3-4x^2+15x-10

Oldo answered Apr 30, 2018

by Oldo

8.3k points

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