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x^2=18
x= ∨ x=
b) 2x^2-1=17
x^2=9
x=3 ∨ x=-3
c) 12-3x^2=0
x^2=4
x=2 ∨ x=-2
d)6x^2=8-x^2
7x^2=8
x= ∨ x=
e)4(x^2+2)=8
4x^2+8=8
4x^2=0
x=0
f) 5+(x^2)/2-4=0
x^2=-1
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