Question

1- efetue e reduza os termos semelhantes

a) (3x+2). (x-3)

b) (3a²+ 2a+ 4 ). (-a - 3)

c) (-2x +5). ( 6x²+4x +3 )

Answer 1

A) (3x + 2 ) × (x-3 ) =
3x.x +3x.-3 +2.x +2.-3 =
3x² -9x +2x -6 =
3x² -7x -6

B) (3a² + 2a + 4 )× (- a -3) =
3a².-a +3a².-3 +2a.-1 +2a.-3 +4.-a +4.-3 =
9x³ -9a² -2a -6a -4a -12 =
9x³ -9a² -12a -12

C) (-2 x + 5) × ( 6 x² + 4 x + 3 ) =
-2x.6x² -2x.4x -1x.3 +5.6x² +5.4x +5.3=
-12x³ -8x² -3x +30x² +20x +15 =
-12x³ -8x² +30x² -3x +20x +15 =
-12x² +22x² +17x +15