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Solve-Real roots-Intersections
Con il contributo di: Heinrich
  • 1. Solve x2 – 3x – 4 = 0
A) x = ±1
B) x = -4, x = 1
C) no solution
D) x = 4, x = -1
  • 2. What are the real roots of y = x2 – 3x – 4?
A) (x – 1) and (x + 1)
B) no real roots
C) (x + 4) and (x - 1)
D) (x – 4) and (x + 1)
  • 3. How many times does x2 – 3x – 4 = y intersect the x-axis?
A) 3
B) 0
C) 1
D) 2
  • 4. Solve x2 + 6x + 9 = 0
A) no solution
B) x = 3
C) x = 3 and x = -3
D) x = -3
  • 5. What are the real roots of y = x2 + 6x + 9?
A) (x – 3) and (x + 3)
B) (x – 3)
C) no real roots
D) (x + 3)
  • 6. How many times does x2 + 6x + 9 = y intersect the x-axis?
A) 2
B) 1
C) 3
D) 0
  • 7. Solve x2 + 4 = 0
A) x = 2
B) no solution
C) x = -2
D) x = ±2
  • 8. What are the real roots of y = x2 + 4?
A) (x – 2) and (x + 2)
B) no real roots
C) (x - 2)
D) (x + 2)
  • 9. How many times does x2 + 4 = y intersect the x-axis?
A) 2
B) 3
C) 1
D) 0
  • 10. When I ask you for the real roots of a quadratic function, I am asking you to
A) find the line of symmetry
B) solve
C) graph
D) find the y-intercept
  • 11. Which way does y=–5x2+3x–7 open?
A) up
B) to the left
C) down
D) to the right
  • 12. Which way does y = 2 + 3x – 4x2 open?
A) down
B) up
C) to the left
D) to the right
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