Solving Quadratic Equations by Square Root

What is the error made when saving this quadratic equation?

• There should be 2 answers, because the square root of 9 is -3 and 3

• Taking the square root should always be the first step

• 21 -3 is not 18 so that was a mistake from the start

• The answer should be x = - 4 because the square root of 9 is -3

Tags

CCSS.HSA-REI.B.4B

What is the error made when solving this quadratic equation?

• The answer should only be -2 since the square root of -4 is -2

• The answer should only be 2, because the native cancels out, since we took the square root of a negative

• There is no error, everything was done correctly

• The answer should be no real solutions, since we can't take the square root of a negative

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

Solve this quadratic equation

• 
• 
• 
• 
• 

Tags

CCSS.HSA-REI.B.4B

• A
• B
• C
• D

Tags

CCSS.8.EE.A.2

Solve using square roots.

• A

• B

• C

• D

Tags

CCSS.HSA-REI.B.4B

• {6.78,-6.78}

• {8,-8}

• {7,-7}

• No Solution

Tags

CCSS.8.EE.A.2

3x² = 12

• ± 2

• 2

• ± √12

• ± 4

Tags

CCSS.8.EE.A.2

• -45 and 45
• -5 and 5
• -225 and 225
• -15 and 15

Tags

CCSS.8.EE.A.2

Solve for x.

-7(x + 3)² + 63 = 0

• x = 0, 6

• x = -6, 12

• x = -6, 0

• x = 6, 12

Tags

CCSS.HSA-REI.B.4B

• No Solution

• x = 3, -3

• x = -21, 21

• x = 7, -7

Tags

CCSS.HSA-REI.B.4B