An equation of degree three means it is a cubic equation and a cubic equation can have only three solutions.
What is degree and how it defines equation?
The highest power to which any equation's variable can be raised is indicated by the equation's degree. When any variable's maximum power is "1," an equation is said to be of the first degree. An equation is referred described as being of the second degree if any variable's maximum power is two. This continues for the third degree, fourth degree, etc.
For an equation with degree it will be of the form a x³+b x²+c x+d=0
And as equation have maximum solution as there degree.
So there will be three solutions of an equation of degree 3.
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