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(4x-1)(4x+1)=0
4x=1 4x=-1
x=1/4 x=-1/4
b) 1-9/4x²=0
(1-3/2x)(1+3/2x)=0
3/2x=1 3/2x=-1
x=2/3 x=-2/3
c)25-4x²=0
(5-2x)(5+2x)=0
2x=5 2x=-5
x=2,5 x=-2,5
d)3-2x²=0
(√3-√2x)(√3+√2x)=0
√2x=√3 √2x=-√3
x=√1,5 x=-√1,5