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Mathematics 2 ESO – Unit 7 EQUATIONS Page 73 – Activity 22

a)  Watch the video and sing the song:

“The quadratic formula is negative b

plus or minus the square root

of b squared minus 4ac

all over 2a”.

b)  Listen to the song and answer:

  • I) What is in the denominator of the “quadratic Formula”?
  • II) What is inside the square root of the “quadratic Formula”?
  • III)  In the example, what is the value of “b”?
  • IV) How many solutions are there if the discriminant is negative?
  • V) How many solutions has the equation in the example? Why?
  • VI) Solve:
      • x2 + 2x – 8 = 0
      • 2x2 + 4x + 2 = 0
      • 3x2 + 5x + 6 = 0