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Mathematics

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Quizzes in Mathematics for Grade 8

Let A = {5, 8, 12, 13, 15} and B = {4, 6, 8, 12, 13}. What is A ∪ B?

  • {4, 5, 6, 8, 12, 13, 15}
  • {5, 15}
  • {4, 6}
  • {8, 12, 13}
Correct answer(s):
  • {4, 5, 6, 8, 12, 13, 15}

Solve the system: 2x + 3y = -2 and 1x – 1y = 9.

  • x = 6, y = -5
  • x = -2, y = 9
  • x = -4, y = 5
  • x = -5, y = 4
  • x = 5, y = -4
Correct answer(s):
  • x = 5, y = -4

Factorize: x² + 12x + 35.

  • (x – 7)(x – 5)
  • (x + 7)(x – 5)
  • (x + 12)(x + 35)
  • x(x + 12) + 35
  • (x + 7)(x + 5)
Correct answer(s):
  • (x + 7)(x + 5)

Multiply the matrix [[5, 1], [0, -5]] by -2.

  • [[5, -2], [0, -5]]
  • [[-10, -2], [0, 10]]
  • [[3, -1], [-2, -7]]
Correct answer(s):
  • [[-10, -2], [0, 10]]