Factorize: x² + 20x + 100.
Correct answer(s):
- (x + 10)(x + 10)
Subject
Mathematics
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Quizzes in Mathematics for Grade 8
Let A = {3, 7, 10, 14, 17} and B = {1, 4, 6, 7, 10, 14}. What is A ∩ B?
Correct answer(s):
- {7, 10, 14}
Which ordered pairs satisfy y = 2x − 1?
Correct answer(s):
- (1, 1)
- (−1, −3)
- (3, 5)
- (2, 3)
The sequence is 13, 10, 7, 4, … . What is the 15th term?
Correct answer(s):
- -29
The sequence is 3, 10, 17, 24, … . What is the 15th term?
Correct answer(s):
- 101
Simplify √343 as much as possible.
Correct answer(s):
- 7√7
Solve for x: 6x – 1 = -1.
Correct answer(s):
- 0
Simplify √117 as much as possible.
Correct answer(s):
- 3√13
Expand and simplify: (x – 8)².
Correct answer(s):
- x² - 16x + 64
Expand and simplify: (x + 1)².
Correct answer(s):
- x² + 2x + 1
Let A = {1, 5, 11, 12, 13} and B = {3, 6, 8, 10, 11}. What is A ∪ B?
Correct answer(s):
- {1, 3, 5, 6, 8, 10, 11, 12, 13}
Which of the following numbers are prime numbers? Select all correct answers.
Correct answer(s):
- 2
- 3
- 5
Simplify √112 as much as possible.
Correct answer(s):
- 4√7
Expand and simplify: (x – 5)².
Correct answer(s):
- x² - 10x + 25
Solve for x: 9x + 7 = 43.
Correct answer(s):
- 4
Add the matrices [[-2, 0], [-4, 5]] and [[-1, 3], [1, 4]].
Correct answer(s):
- [[-3, 3], [-3, 9]]
Simplify √63 as much as possible.
Correct answer(s):
- 3√7
Solve the inequality: 7x + 9 ≤ 37.
Correct answer(s):
- x ≤ 4
If U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} and A = {3, 7, 9, 10, 11}, what is A′?
Correct answer(s):
- {1, 2, 4, 5, 6, 8, 12}
A fair 5-section spinner and a fair 5-section spinner are spun once. What is the probability of getting one chosen section on each spinner?
Correct answer(s):
- 1/25