Class 4 Recap (Wed Feb 7)

Links

• WebWork: https://mathww.citytech.cuny.edu/webwork2/MAT1275-S24-Ganguli-D225
• The following 3 WebWork sets are due Friday evening (Feb 9)
  • Expressions-Arithmetic-Order of Operations
  • Expressions-Arithmetic-Introduction to Expressions
  • Expressions-Arithmetic-Integer Exponents

Topics

• We continued with Sec 1.2: Polynomials (in particular Sec 1.2.1 and Sec 1.2.2)

First we did a couple more examples from the “Integer Exponents” WebWork:

We introduced polynomials of various degrees:

Polynomials are degree 1 are simply “linear expressions,” i.e., expressions of the form Ax + B; an example from “Linear Expressions” WebWork:

Previewing how we will solve quadratic equations using the quadratic formula:

We looked at the graph of the quadratic polynomial above in Desmos, and noted how the solutions of the corresponding quadratic equation give the x-intercepts of the parabola. See: https://www.desmos.com/calculator/mutsgaaxwe

Multiplying polynomials–in particular, using “FOIL” to multiply two (linear) “binomial” expressions:

Another example from “Multiply Polynomials”: