X to the second power +18x-4=0 solve
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x^2 + 18x - 4 = 0
a = 1, b = 18, c = -4
x = [-b ± √(b^2 - 4ac)] / 2a
x = [-18 ± √(18^2 - 4 * 1 * -4)] / (2 * 1)
x = [-18 ± √340] / 2
x = -9 ± √85
Answer: x = -9 - √85, -9 + √85
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