Question

qual a seguinte equação incompleta do 2°gral:5x²-3125=0
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Answer 1

$5x^2-3125=0\\\\5x^2-3125+3125=0+3125\\\\5x^2=3125\\\\\frac{5x^2}{5}=\frac{3125}{5}\\\\x^2=625\\\\x=\sqrt{625},\:x=-\sqrt{625}\\\\x=25,\:x=-25$