Question

calcule:

a) 2x . ( 3x²) - 4x . (x²)
b) a.(- 7a^3) - 2a² . (-5a²)
c)a^5 + (7a²) - (- 2a3)
x^3y. (15xy)- x². (3x²y²)

Answer 1

a)
2x.(3x²)-4x.(x²)=
6x³-4x³=2x³

b)
a(-7a³)-2a².(-5a²)=
$-7a^4+10a^4=3a^4$

c)
$a^5+(7a^2)-(-2a^3)= \\ a^5+7a^2+2a^3$

d)
$x^3y.(15xy)-x^2.(3x^2y^2)= \\ 15x^4y^2-3x^4y^2=12x^4y^2$