Free Printable Quizizz 9.3 Square Roots to Solve Quadratics (#9)

1.

Which equation can be solved using square roots?

a)

3x² + 2x + 1 = 0

b)

3x² -27 = 0

c)

3x² + 2x = 1

d)

4x + 10 = 0

2.

How many solutions does the equation have?
$x^2+7=7$

a)

1 Real Solution

b)

2 Real Solutions

c)

No Real Solution

3.

How many solutions does the equation have?
$-8x^2=80$

a)

1 Real Solution

b)

2 Real Solutions

c)

No Real Solution

4.

Solve using Square Roots.
$x^2-3=78$

a)

$\pm9$

b)

9

c)

-9

d)

no real solution

5.

Solve for x.
$x^2+15=0$

a)

$\pm15$

b)

$\pm3.87$

c)

$\pm7.85$

d)

No Solution

6.

Solve by taking square roots:
$5m^2+1=6$

a)

$m=0$

b)

$m=-1\ or\ 1$

c)

no real solutions

d)

$m=\frac{7}{5}\ or\ m=-\frac{7}{5}$

7.

Find the solutions.
$5b^2-4=41$

a)

b = 9, b = -9

b)

b = 3, b = -3

c)

b = 8, b = -8

d)

no real solution

8.

Solve
$4m^2-100=0$

a)

m=25, -25

b)

m=96

c)

m=5, -5

d)

m=-96

9.

Solve

x² = 121

a)

x = 60.5

b)

x = ± 11

c)

x = ± 12

d)

x = 11

10.

Solve by taking square roots:

k² +50 = 43

a)

$k=\sqrt{7}$

b)

$k=\pm93$

c)

$k=\pm7$

d)

no real solution

11.

Solve: x² - 81 = 0

a)

9

b)

9 and -9

c)

81 and -81

d)

no real solutions

12.

Find the roots.
$x^2=10$

a)

$\pm4.7$

b)

$\pm3.2$

c)

$\pm2$

d)

$\pm5$

13.

Find the solutions.
$4x^2=64$

a)

x = ± 16

b)

x = 16

c)

x = ± 4

d)

x = 4

14.

Find the zeros: 2x² - 30 = 20

a)

$\pm5\sqrt{2}$

b)

5 and -5

c)

5

d)

no real solutions

15.

Explain why the equation cannot be solved using square roots.
$x^2+3x=0$

4 lines

16.

If graphed, how many times would the parabola touch the x-axis? Explain your reasoning.
$x^2-16=0$

4 lines

Quizizz 9.3 Square Roots to Solve Quadratics (#9)

Total questions: 16

Worksheet time: 4hrs 0mins

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