Question

4) Efetue as multiplicacoes com monomios.
A) - 10 a².5 a
B) 30 x8 y5. 2 x y
C) -5 a² b.7a³b²
D) -8 x y. - 5 x y

Answer 1

$A) - 10 a^2 \cdot 5 a = (-10 \cdot 5) \cdot (a^2 \cdot a) = -50 \cdot a^{2+1} = -50 a^3 \\\\ B) 30 x^8 y^5 \cdot 2 x y = (30 \cdot 2) \cdot (x^8y^5 \cdot xy)= 60 \cdot x^{8+1}y^{5+1}= 60x^9y^6\\\\ C) -5 a^2 b \cdot 7a^3b^2 = (-5 \cdot 7) \cdot (a^2b \cdot a^3b^2)=-35 \cdot a^{2+3}b^{1+2}=-35a^5b^3\\\\ D) -8 x y \cdot - 5 x y = [(-8) \cdot (-5)] \cdot (xy \cdot xy)= 40 \cdot x^{1+1}y^{1+1}= 40 x^2y^2$

Bons estudos!