Solving Quadratic Equations Square Root

Solve by taking square roots.

x² - 49 = 0

• x = -7, x = 7

• x = -7

• x = 7

• x = -7, x = 1

Tags

CCSS.HSA-REI.B.4B

Solve using square roots.

5b² - 4 = 41

• b = 9, b = -9

• b = 3, b = -3

• b = 8, b = -8

• no real solution

Tags

CCSS.8.EE.A.2

For this quadratic equation, we said that there are NO REAL SOLUTIONS. Why did we say that?

• Because 3 goes into 9, so those cancel out

• Because we cannot take the square root of a negative number

• Because a has to be equal to 1

• Because there is no c value

Tags

CCSS.HSA-REI.B.4B

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

What is this symbol called?

• Square Root

• Root

• Square

• Factor

What are the solutions of this quadratic equation?

• x = 49

• x = 11

• x = -3

• x = 3

• x = -11

Tags

CCSS.HSA-REI.B.4B

Find the zeros of this quadratic equation

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Tags

CCSS.HSA-REI.B.4B

Solve this quadratic equation

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Tags

CCSS.HSA-REI.B.4B

How do we undo something that is squared?

• Multiplication

• Square it

• Take the square root

• Division

Tags

CCSS.HSA-REI.B.4B