End of Course Review NUMBER SENSE, QUADRATIC FUNCTIONS AND OPERATION SKILLS DAY 2.

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End of Course Review NUMBER SENSE, QUADRATIC FUNCTIONS AND OPERATION SKILLS DAY 2

Warm Up Day 2 1. What is the complex conjugate of -2 – 3i? 2. What is the product of (4 + 3i) and (-7 – 3i)? 3. One of the roots of the quadratic equation x 2 – 4x + 5 = 0 is 2 + i. What is the other root?

Manipulate Complex Numbers  Complex number :  Any number of the form a + bi, where a and b are real numbers and i is an imaginary number whose square equals -1  2 + 3i; -7i; 4 – 5i  Conjugate is the SAME real number OPPOSITE operation of the imaginary unit:  Examples:  Complex NumberConjugate 2 + 3i 2 – 3i -7i7i -4 – 5i i 1. What is the complex conjugate of -2 – 3i? 3. One of the roots of the quadratic equation x 2 – 4x + 5 = 0 is 2 + i. What is the other root?

Manipulating Complex Numbers

 Adding and Subtracting Complex Numbers:  When adding and subtracting complex numbers, combine like terms like you were adding expressions with variables  Example: (8i) + (7 + 3i) – (6i) = 7 + 5i

Manipulating Complex Numbers  Multiplying Complex Numbers:  When multiplying complex numbers, multiply the numbers using multiplication properties, i.e., distribution property.  Simplify by combining like terms.  Remember: i x i = i 2 and i 2 = What is the product of (4 + 3i) and (-7 – 3i)?

Complex Roots – Things to remember Complex Roots – when you have a quadratic equation that does not cross the x-axis. Complex Roots – when you are solving a quadratic equation by the quadratic formula and you get a negative number under the radical sign.. Example: What are the roots to the equation x 2 + 2x + 12?

Using Matrices to Organize Data and Solve Problems

Determinant of a matrix

Inverse of Matrices

Using Inverses to Solve Problems:  Three friends went shopping at their favorite store. All the pants, shirts and sweaters were on sale, and articles of each type cost the same. The table shows the friends purchases. Using the information in the tables, determine the cost of each sweater. # of Pants # of Shirts # of Sweaters Total Alicia552$377 Bette560$322 Cara370$408