Grade 11-12 Elimination

Solve x² – 49 = 0 by extracting the roots.

• 5 and -5

• 6 and -6

• 7 and -7

• 8 and -8

What constant should be added to both sides of the equation x² + 4x – 21 = 0, so that it can be solved by completing the square?

• 2

• 4

• 6

• 9

Simplify √28

• 7√2

• 7√4

• 4√7

• 2√7

3. Which of the following is a quadratic equation written in standard form?

• 3m + 8 = 15

• x² - 5x + 10 = 0

• x² + 19 = -3x

• (x – 4)² + 8 = 0

• 100

• 400

• 40

• 20

The 10th term of an arithmetic sequence is 22 with a common difference of -2. Find a₁.

• 34

• 36

• 40

• 42

How many terms are in an arithmetic sequence whose first term is -3, common difference is 2, and last term is 23?

• 12

• 13

• 14

• 15

Two fair coins are tossed. The probability of getting two heads is