Knowee
Questions
Features
Study Tools

Find the common zeroes of the polynomial x3 + 5x2 – 9x – 45 and x3 + 8x2 + 15x.

Question

Find the common zeroes of the polynomial x3 + 5x2 – 9x – 45 and x3 + 8x2 + 15x.

🧐 Not the exact question you are looking for?Go ask a question

Solution

To find the common zeroes of the two polynomials, we first need to find the zeroes of each polynomial separately.

  1. For the first polynomial x^3 + 5x^2 - 9x - 45 = 0, we can factor it to get (x-3)(x+3)(x+5) = 0. So the zeroes of the first polynomial are x = 3, -3, -5.

  2. For the second polynomial x^3 + 8x^2 + 15x = 0, we can factor out an x to get x(x^2 + 8x + 15) = 0. Further factoring gives x(x+3)(x+5) = 0. So the zeroes of the second polynomial are x = 0, -3, -5.

  3. Comparing the zeroes of the two polynomials, we see that the common zeroes are x = -3 and x = -5.

This problem has been solved

Similar Questions

Zero(s) of polynomial  x3 − 5x2 + 8x − 4 is/are

Find the zero of the polynomials in each of the following cases.(i) p(x) = x+5

Compute the zeroes of the polynomial 4x2 – 4x – 8. Also, establish a relationship between the zeroes and coefficients.

y = x5 − 10x3 + 9x(a) Find the zeros algebraically. (Enter your answers as a comma-separated list. If there are no real zeros, enter DNE.)

What is the product of the polynomials (2x² +  5x)(x – 3)?

1/3

Upgrade your grade with Knowee

Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.