Question

Me ajudem, pfvr...

1 - Calcule
(3x+5)³

(5x-2)³

2 - Resolva as equações

2(x-4)=5-x

-2(-x+1)=3(x-1)

Answer 1

1-
(3x+5)³= 27x³+125
 
(5x-2)³=125x³-8

2-
 
2(x-4)=5-x
2x-8=5-x
2x+x=5+8
3x=13
x=13/3

-2(-x+1)=3(x-1)
2x-2=3x-3
2x-3x=-3+2
-x=-1 .(-1)
x=1

Answer 2

(3x+5).(3x+5).(3x+5)=
(3x+5).(3x+5)= 15x²+15x+15x+25=
15x²+30x+25.(3x+5)
45x³+90x²+75x+75x²+150x+125
=45x³+165x²+225x+125

(5x-2).(5x-2).(5x-2)
(5x-2).(5x-2)= 25x²-10x-10x+4
25x²-20x+4.(5x-2)=
125x³-100x²+20x-50x²+40x+8
125x³-150x²+60x+8