The Quadratic Formula

Question 1

Which equation has the solutions ?

Revolt · Accepted Answer

x2 + 3x + 3 = 0

Question 2

Which equation has the solutions ?

Revolt · Accepted Answer

3x2 – 10x – 1 = 0

Question 3

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 4

Which equation could generate the curve in the graph below?

Revolt · Accepted Answer

y = –2x2 – 16x – 28

Question 5

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 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

Which equation shows the quadratic formula used correctly to solve 5x2 + 3x – 4 = 0 for x?

Revolt · Accepted Answer

x = StartFraction negative 3 plus-or-minus StartRoot (3) squared minus 4 (5) (negative 4) EndRoot Over 2 (5) EndFraction

The Quadratic Formula Answers