एक्स क्यूब प्लस टू एक्स स्क्वायर प्लस 5 एक्स प्लस 10
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solve
x^3+2x^2+5x +10
let the x^2 = x
then
x^2 + 2x + 5+ 10
x^2 + 2x + 15 = 0
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