Question

CALCULE:
a) 2x.(3x²) - 4x. (x²)
b) a elevado a 5 + (7a²). (-2a³)
c) a. (-7a³) - 2a². (-5a²)=
d) x³y.(15xy)- x².(3x²y²)=


6x³-4x²

Answer 1

a)
$2x.(3x^2)-4x.(x^2)=6x^3-4x^3=2x^3$

b)
$a^5+(7a^2).(-2a^3)=a^5+(-14a^5)=a^5-14a^5=-13a^5$

c)
$a.(-7a^3)-2a^2.(-5a^2)=-7a^4+10a^4=3a^4$

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