Question

1- calcule os seguintes produtos:

a) b5.b4 =
b) 5x6.2x =
c) 7y3.3y2 =
d) 4x3y2.2x5y7 =

Answer 1

1 -

a)

${b}^{5} \times {b}^{4} = {b}^{5 + 4} = {b}^{9}$

b)

$5 {x}^{6} \times 2x \\ \\ (5 \times 2) \times ( {x}^{6} \times {x}^{1} ) \\ \\ 10 \times {x}^{6 + 1} \\ \\ 10 {x}^{7}$

c)

$7 {y}^{ 3} \times 3 {y}^{2} \\ \\ 7 \times 3 \times {y}^{3} \times {y}^{2} \\ \\ 21 {y}^{3 + 2} \\ \\ 21 {y}^{5}$

d)

$4 {x}^{3} {y}^{2} \times 2 {x}^{5} {y}^{7} \\ \\ 4 \times 2 \times {x}^{3} \times {x}^{5} \times {y}^{2} \times {y}^{7} \\ \\ 8 \times {x}^{3 + 5} \times {y}^{2 + 7} \\ \\ 8 {x}^{8} {y}^{9}$