Quadratic Formula Error

What is this formula?

• This is the speed of light formula.

• This is the quadratic formula.

• This is the zero product property.

• This is scary.

Tags

CCSS.HSA-REI.B.4B

Use the quadratic formula to find the solutions for

y = -x² - 5x + 12

• -4.9 and -0.1

• -8.54 and 8.54

• -0.45 and 3.55

• -6.77 and 1.77

Tags

CCSS.HSA-REI.B.4B

The discriminant is

• ax² + bx + c

• b - 4ac

• b² - 4ac

• b² + 4ac

Tags

CCSS.HSA-REI.B.4B

Describe and correct the error a student made in solving an equation.

• The student used b instead of −b in the first term in the numerator when substituting values into the formula

• The student should have the equation as a(x−b)²+c=0 and then substituted those values into the Quadratic Formula.

• The student dropped the negative sign in simplifying the expression (−5)².

• The student used a instead of 2a in the denominator when substituting values into the formula.

Tags

CCSS.HSA-REI.B.4B

j

h

d

4ac-b^2

-b^2-4ac

-b

b

b^2+4ac

2a

a^2

b^2-4ac

-2a

b^2

Tags

CCSS.HSA-REI.B.4B

Tags

CCSS.HSA-REI.B.4B

What is the quadratic formula?

Tags

CCSS.HSA-REI.B.4B

Solve x² - 5x + 10 = 0

• (5 - i√15)/2  ,  (5 + i√15)/2

• (5 - √15)/2  ,  (5 + √15)/2

• (5 - i√65)/2  ,  (5 + i√65)/2

• (5 - √65)/2  ,  (5 + √65)/2

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

Where did the mistake occur in this QUADRATIC FORMULA example?

Tags

CCSS.HSA-REI.B.4B

Use the quadratic formula to solve 2x² + 2x - 12.

• -2, 3

• 2, 3

• 2, -3

• -2, -3