# How do you find the roots of a cubic equation?

## How do you find the roots of a cubic equation?

The general form of a cubic function is: f (x) = ax3 + bx2 + cx1 + d. And the cubic equation has the form of ax3 + bx2 + cx + d = 0, where a, b and c are the coefficients and d is the constant.

### Can cubic polynomials have all complex roots?

so the intermediate value theorem provides one real value r such that f(r)=0. Since the equation has at most three distinct roots, it follows that it cannot have three distinct complex nonreal roots. Your argument is an almost correct proof of the fact that a cubic equation cannot have three complex (non-real) roots.

How many complex roots does a cubic equation have?

three complex roots
Cubic equation is the equation which has the highest exponent of the variable as 3. Therefore the numbers of roots of a cubic equation are three and these roots can be real roots or the complex roots. Therefore, we can say that a cubic equation can have three complex roots.

Can a cubic equation have 2 roots?

Just as a quadratic equation may have two real roots, so a cubic equation has possibly three. But unlike a quadratic equation which may have no real solution, a cubic equation always has at least one real root. If a cubic does have three roots, two or even all three of them may be repeated.

## What is the formula to find the cubic polynomial?

Hint: A cubic polynomial is the polynomial whose degree is 3 and it has 3 roots. We will use the sum, sum of the products and products given in the question to find the cubic polynomial. sum of products = α+β+γ=−ba, where b is the coefficient of x2 and a is the coefficient of x3.

### Can a cubic equation have 3 complex roots?

Can a cubic polynomial have 2 roots?

If we count roots according to their multiplicity (see The Factor Theorem), then: A polynomial of degree n can have only an even number fewer than n real roots. Thus, when we count multiplicity, a cubic polynomial can have only three roots or one root; a quadratic polynomial can have only two roots or zero roots.

Can a cubic equation have three complex roots?

## How do you factor a cubic polynomial with 2 terms?

Multiply the two cube roots together to get the second term of the second factor. In the above example, the first and third terms are x^2 and 9, respectively (3 squared is 9). The middle term is 3x. Write out the second factor as the first term minus the second term plus the third term.

### How many zeros can a cubic polynomial have?

three zeros
Regardless of odd or even, any polynomial of positive order can have a maximum number of zeros equal to its order. For example, a cubic function can have as many as three zeros, but no more.