Question

1)Efetue os calculos

a) 2 x . ( x + 5 )

b) 3 x2 . ( 2X2 - 4X)

c)(5x^4 + 15X^7 - 10X) : 5 x

d) ( 18 a^5 - 6 a ^10 - 3a^4) : 3 a^2

Answer 1

$a)2 x^{2} + 10x$

Answer 2

$a) 2 x . ( x + 5 )= 2 x^{2} +10x \\ b) 3 x^{2} . ( 2 x^{2} - 4x)=6 x^{4}-12 x^{3} \\ c)(5x^4 + 15x^7 - 10x) : 5 x =\frac{5x( x^{3}+3 x^{6}-2)}{5x}= x^{3} +3 x^{6}-2 \\ d) ( 18 a^5 - 6 a^{10} - 3a^4): 3 a^2= \frac{3 a^{4}(6a- a^{6}-1 ) }{3 a^{2} } = a^{2}(6a- a^{6}-1 ) \\ ou \\ ( 18 a^5 - 6 a^{10} - 3a^4): 3 a^2= \frac{3 a^{2}(6 a^{3} - a^{8}- a^{2} ) }{3 a^{2} } =6 a^{3} - a^{8}- a^{2}$