Day: October 22, 2021

Class Info

• Date: Fri Oct 22, 10a-11:40a
• Meeting Info: Blackboard Collaborate Ultra
  • guest login
  • dial-in: 571-392-7650 (PIN: 834 671 1314)

Topics

• Cont’d from yesterday: Graphs of quadratic polynomials ( y = ax^2 + bx + c )
  • parabolas – “symmetric open U shape”
  • the vertex ( x = -b/2a )
  • the y-intercept ( at y = c, i.e, at the point (0, c) )
  • the x-intercepts (solve ax^2 + bx + c = 0 )
    • the zeroes (the “roots”) of a quadratic polynomial = x-intercepts of the corresponding parabola!
  • see OpenStax Sec 9.6
  • “Transformations” (vertical & horizontal shifts) of parabolas
    • see OpenStax, Sec 9.7

To-Do After Class

• Join peer-led tutoring session with Nojm Ahmed (12-1p via Zoom)
  • See also the Math Dept’s drop-in online tutoring schedule!
• Finish WebWork set: “ComplexNumbers” (due tonight, Fri Oct 22)
• Start on WebWork sets re parabolas: “ParabolaLab”, “ShiftingParabolas”, “ParabolaVertices-CtS” (due Thurs Oct 28)