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Solving x2 + bx + c = 0

Mathematics

7th - 9th Grade

CCSS covered

Used 114+ times

Solving x2 + bx + c = 0
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7 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Factor x2 – 7x + 12.

(x – 6)(x – 2)
(x + 3)(x + 4)
(x – 3)(x – 4)
(x + 6)(x + 2)

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Factor x2 – 4x – 32.

(x +16)(x – 2)
(x – 16)(x + 2)
(x + 8)(x – 4)
(x – 8)(x + 4)

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

When factoring quadratic trinomials of the form x2 + bx + c, what is true about m and n if the factored form is (x + m)(x + n)?

Their sum is equal to c, and their product is equal to b.
The sum of b and c is equal to the product of m and n.
Their sum is equal to b, and their product is equal to c.
The product of b and c is equal to the sum of m and n.

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Suppose the area of a square is x2 – 10x + 25. What is the perimeter of the square? Hint: Factor the above first to find the side lengths.

2x – 10
4x
4x – 20
2x

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Solve x2 – x – 72 = 0.

x = -8
x = -8 or x = 9
x = 8 or x = -9
x = 9

Tags

CCSS.HSA-REI.B.4B

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Solve a2 – 12a = -27.

a = 3
a = 9
a = 3 or a = 9
a = -27 or a = -15

Tags

CCSS.HSA-REI.B.4B

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Factor x2 – 4x – 32.

(x – 16)(x + 2)
(x – 8)(x + 4)
(x + 8)(x – 4)
(x +16)(x – 2)

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