Question

4) Efetuar as operações indicadas a) (5ab – 3c + 4d) - (-2d + 3c – 4ab)= b) (3x2-4x-3).(x+1) c) (3x4-6x3+10x2): (-2x2)

Answer 1

a) (5ab – 3c + 4d) - (-2d + 3c – 4ab)=

$5ab -3c + 4d + 2d -3c + 4ab =$

$5ab + 4ab - 3c - 3c + 4d + 2d =$

$9ab -6x + 6d =$

 

b) $(3x^2-4x-3).(x+1)=$

$3x^3 + 3x^2 - 4x^2 - 4x -3x -3=$

$3x^3 + x^2(3-4) - x(4-3) -3 =$

$3x^3 - x^2 -x - 3=$

 

c) $\frac{(3x4-6x3+10x2)}{(-2x2)}=$

$\frac{3x^4}{-2x^2} - \frac{-6x^3}{-2x^2} - \frac{10x^2}{-2x^2}=$

$\frac{-3x^2}{2} + 3x - 5=$