1st Periodical Exam (Reviewer) MATHEMATICS 9

A quadratic equation in one variable is written in the form ax² + bx + c = 0. Which of the following is true about the values of a, b and c

• a, b. c are any number

• a, b and c are real number and a ≠ 0.

• a, b and c are real numbers

• a, b and c are real numbers and c is a constant.

Which of the following is a quadratic equation?

• y = 3^x

• x³ + 3x² - 17 = 0

• (x-8)(x+1) = 15

• xy = 5²

In the equation (x-3)² = 16, what are the values of x ?

• 7 and -1

• -7 and 1

• -7 and -1

• 7 and 1

Which of the following quadratic equations can be solved easily by extracting the square roots?

• y² - 3y -10

• 4m²-64 = 0

• 5n² + 7n -51

• 6x²-9x+12

Which of the following equations has roots of 4 and -4

• x² + 8x + 16

• x² + 8x - 16

• x² - 16

• x² + 16

If x² + 6x = 16 will be solved by completing the squares, what must be added to both sides to make the left side a perfect square?

• -9

• 9

• -3

• 3

Find the solution/s of x² - 5x + 2 = 0, using quadratic formula

What is the value of the discriminant in the quadratic equation x² - 10x + 12

• 0

• -10

• 12

• 52

In the quadratic equation, if the value of b² - 14ac < 0, then what is the nature of the roots?

• real, rational and unequal roots

• imaginary roots

• real, irrational and unequal roots

• real, rational and unequal roots.

In symbol, represent the sum of the roots of the quadratic equation ax² + bx + c

• -b/a

• b/a²

• -c/a

• c/a