POLYNOMIALS 9/20/2015
Jan 19, 2016
POLYNOMIALS9/20/2015
STANDARD FORM OF A POLYNOMIAL
ax + bx + cx … mx + kn n-1 n-2
The degree is ‘n’
WHAT’S THE DEGREE?
VIETA’S FORMULASDegree of the polynomial
FIND THE FOLLOWING:
COMPLEX CONJUGATE THEOREM
i =
3i
WHY DOES THAT HAPPEN?
• the quadratic formula
• If I solve it for a polynomial like
DESCARTES RULE OF SIGNS
• Helps you find out how many possible positive and negative roots a function has
For POSITIVE Roots:
1. List coefficients in order
2. Count sign changes
3. Subtract 2 to account for imaginary roots
For NEGATIVE Roots: 1. Solve for f(-x) and then list
coefficients in order2. Count sign changes3. Subtract 2 to account for
imaginary roots
LET’S DO THIS EXAMPLE TOGETHER
RATIONAL ROOTS THEOREM
• Function must have integer coefficients
FIND ALL RATIONAL ROOTS OF:
SO WHEN WE GET THE POSSIBLE ROOTS, HOW DO WE FIND OUT WHICH ONES WORK?
• Use synthetic division: