Question

resolva as equaçoes imcomletas

a) 7x²=0

b) 2x²-8=0

c) -2x²-8=0

d)-2x²+8=0

e) x²-49=0

f)x²+1=0

g)x²+3=19


h)x²-1=48

Answer 1

a)7x²=0, x²=0/7, x²=0, x=V0, x=0 S={0}

b)2x²-8=0, 2x²= 8, x²=8/2=4, x²=4, x=V4, x=-+2. S={-2,+2}

c)-2x²-8=0, -2x²=8, x²=8/-2, x²=-4, x=V-4, x=impossível,não tem raíz ²negativa

d)-2x²+8=, -2x²= -8/-2,x²=4, x=V4,x=-2,+2, S{-2,+2}

e)x²-49=0, x²=49, x=V49, x=-7,+7  S={-7,+7}

f)x²+1=0, x²=-1, x=V-1, impossível

g)x²+3=19, x²=19-3, x²=16,x=V16, x=-4,+4, S={-4,+4}

h) x²-1=48, x²=49, xV49,x=-7,+7, S{-7,+7}