Presentation on theme: "Algebra 2. Warm Up A monomial is an expression that is either a real number, a variable or a product of real numbers and variables. A polynomial."— Presentation transcript:
A monomial is an expression that is either a real number, a variable or a product of real numbers and variables. A polynomial is a monomial or the sum of monomials. The exponent of the variable in a term determines the degree of that term. Standard form of a polynomial has the variable in descending order by degree.
Two people per worksheet. Take turns at each step, first partner decides what you multiply the divisor by, second partner agrees and does the multiplication, first partner agrees and does the subtraction, then switch for next term. You may do the work on the worksheet, paper or the white board. If you use the white board you must have me check EACH answer as you complete it.
Warm Up: 1. Write a polynomial function in standard form with zeros at -1, 2 and 5. 2. Use long division to divide: 3. Use long division to divide
To find all the roots of a polynomial: ◦ determine the possible rational roots using the rational root theorem (a o /a n ) ◦ Use synthetic division to test the possible rational roots until one divides evenly ◦ Write the factored form and solve for all roots Use the quadratic formula if necessary You may need to use synthetic division more than once
Warm Up Find the polynomial equation in standard form that has roots at -5, -4 and 3 Find f(-2) for f(x) = x 4 – 2x 3 +4x 2 + x + 1 using synthetic division Solve x 4 – 100 = 0
Practice Problem: List all the possible rational roots of ◦ 3x 3 + x 2 – 15x – 5 = 0 Use synthetic division to determine which of these is a root Factor and solve for the rest of the roots of the equation.
Warm Up Find the zeros of the function by finding the possible rational roots and using synthetic division. multiply each and write in standard form: (x + y) 2 (x + y) 3 (x + y) 4
Notice that each set of coefficients matches a row of Pascal’s Triangle Each row of Pascal’s Triangle contains coefficients for the expansion of (a+b) n For example, when n = 6 you can find the coefficients for the expansion of (a+b) 6 in the 7 th row of the triangle. Use Pascal’s Triangle to expand (a+b) 6
If the terms of the polynomial have coefficients other than 1, you can still base the expansion on the triangle.