The Quadratic Formula

Question 1

The graph of an equation with a negative discriminant always has which characteristic?

Revolt · Accepted Answer

no x-intercept

Question 2

Which equation could generate the curve in the graph below?

Revolt · Accepted Answer

y = –2x2 – 16x – 28

Question 3

If the discriminant of a quadratic equation is equal to , which statement describes the roots?

Revolt · Accepted Answer

There are two complex roots.

Question 4

Which equation shows the quadratic formula used correctly to solve 7x2 = 9 + x for x?

Revolt · Accepted Answer

x = StartFraction 1 plus-or-minus StartRoot (negative 1) squared +4 (7) (9) EndRoot Over 2 (7) EndFraction

Question 5

What is the discriminant of ?

Revolt · Accepted Answer

76

Question 6

Which equation can be solved using the expression for x?

Revolt · Accepted Answer

2 = 3x + 10x2

Question 7

What is the discriminant of 9x2 + 2 = 10x?

Revolt · Accepted Answer

28

Question 8

If x = –3 is the only x-intercept of the graph of a quadratic equation, which statement best describes the discriminant of the equation?

Revolt · Accepted Answer

The discriminant is 0.

Question 9

If is the only x-intercept of the graph of a quadratic equation, which statement best describes the discriminant of the equation?

Revolt · Accepted Answer

The discriminant is 0.

Question 10

Which equation could generate the curve in the graph below?

Revolt · Accepted Answer

y = 3x2 – 2x + 1

The Quadratic Formula Answers