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5x^{4}-3x^{2}-2=0
To factor the expression, solve the equation where it equals to 0.
±\frac{2}{5},±2,±\frac{1}{5},±1
By Rational Root Theorem, all rational roots of a polynomial are in the form \frac{p}{q}, where p divides the constant term -2 and q divides the leading coefficient 5. List all candidates \frac{p}{q}.
x=1
Find one such root by trying out all the integer values, starting from the smallest by absolute value. If no integer roots are found, try out fractions.
5x^{3}+5x^{2}+2x+2=0
By Factor theorem, x-k is a factor of the polynomial for each root k. Divide 5x^{4}-3x^{2}-2 by x-1 to get 5x^{3}+5x^{2}+2x+2. To factor the result, solve the equation where it equals to 0.
±\frac{2}{5},±2,±\frac{1}{5},±1
By Rational Root Theorem, all rational roots of a polynomial are in the form \frac{p}{q}, where p divides the constant term 2 and q divides the leading coefficient 5. List all candidates \frac{p}{q}.
x=-1
Find one such root by trying out all the integer values, starting from the smallest by absolute value. If no integer roots are found, try out fractions.
5x^{2}+2=0
By Factor theorem, x-k is a factor of the polynomial for each root k. Divide 5x^{3}+5x^{2}+2x+2 by x+1 to get 5x^{2}+2. To factor the result, solve the equation where it equals to 0.
x=\frac{0±\sqrt{0^{2}-4\times 5\times 2}}{2\times 5}
All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. Substitute 5 for a, 0 for b, and 2 for c in the quadratic formula.
x=\frac{0±\sqrt{-40}}{10}
Do the calculations.
5x^{2}+2
Polynomial 5x^{2}+2 is not factored since it does not have any rational roots.
\left(x-1\right)\left(x+1\right)\left(5x^{2}+2\right)
Rewrite the factored expression using the obtained roots.