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4(4x²+5) ≠ 0
(2x+√5)(2x-√5)=0
(2x+√5)=0 v (2x-√5)=0
x=-√5/2 v x=√5/2
(8x² -10) (8x² +10)=0
8x² -10=0 8x²+10=0
8x²=10 /8 8x² =-10 /8
x² =10\8 x² = -10\8
x² =5\4 /√ x² =-5\4 /√
x=√5\4 x=-√5\2
x=√5\2