Question

por favor me ajudem :((( 72 e 73

Answer 1

72)a) -3x²+2x=0
  x(-3x+2)=0
x=0 
-3x+2=0
-3x=-2
x=-2/-3
x=2/3
s={(0,2/3)}
b)x²-9=0
x²=9
x= +ou - $\sqrt{9}$
x=+ou - 3
s={(-3,3)}
c)1/2x²+$\sqrt{2}$x=0
x(1/2x+$\sqrt{2}$=0
x=0
1/2x+$\sqrt{2}$=0
x=$\sqrt{2}$/1/2
x=$2\sqrt{2}$
s+{(0,$2\sqrt{2}$
d) 2x²-32=0
2x²=32
x²=32/2
x²=16
x=$\sqrt{16}$
x=4
s={(-4,4)}
2) a)4(x²+2)=8(x+1)
4x²+8=8x+8
4x²-8x+8-8=0
4x²-8x=0
2x(2x-4)=0
2x=0
x=0
2x-4=0
2x=4
x=4/2
x=2
s={(0,2)}
b)x²-3(x-15)=-4-3x
x²-3x+45=-4-3x
x²-3x+3x+45+4=0
x²+49=0
x²=-49 nao existe raiz quadrada nos conjuntos dos reais logo o conjunto e vazio
s={   ]
c)3x(x-1)=2x
3x²-3x=2x
3x²-3x-2x=0
3x²-5x=0
x(3x-5)=0
x=0
3x-5=0
3x=5
x=5/3
s={(0,5/3)}
d)-6x²+12=0(-1)
  6x²-12=0
6x²=12
x²=12/6
x²=2
x=$\sqrt{2}$

s={($-\sqrt{2}$,$\sqrt{2}$)}