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3 {x}^(2) - 15x = 15 ​
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3 {x}^(2) - 15x = 15
​

User AndreG
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3x^2-15x= 15\\\\x^2 -5x = 5\\\\x^2-5x-5=0\\\\\Delta = 25+20\\\\\Delta = 45\\\\\\x = (5\pm √(\Delta))/(2)\\\\\\x = (5\pm √(45))/(2)\\\\\\x = (5\pm 3√(5))/(2)\\\\\\

User DramboHero
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