Solving Equations with Square and Cube Roots

This video tutorial by Dr. K covers solving equations involving square and cube roots. It begins with an introduction to the concepts of perfect squares and cubes, followed by detailed steps to solve equations using square roots, including examples with multiple solutions. The tutorial then transitions to cube root equations, highlighting the differences in solutions compared to square roots. Special cases, such as equations with no solutions, are also discussed. The video concludes with a summary of key points, emphasizing the importance of isolating variables and understanding when to apply square or cube roots.

What is the first step in solving an equation involving x squared?

• Multiply both sides by 2

• Subtract a constant from both sides

• Isolate the x squared term

• Add a constant to both sides

Tags

CCSS.HSA-REI.B.4B

When solving x squared = 16, what are the possible values of x?

• 8 and -8

• 16 and -16

• 2 and -2

• 4 and -4

Tags

CCSS.8.EE.A.2

Why does the equation x squared = 49 have two solutions?

• Because x can be any number

• Because 49 is a prime number

• Because 49 is a perfect square

• Because both positive and negative numbers squared give positive results

Tags

CCSS.8.EE.A.2

What is the square root of 144?

• 10 and -10

• 11 and -11

• 12 and -12

• 13 and -13

Tags

CCSS.8.EE.A.2

In the equation 2x squared = 288, what is the first step to isolate x squared?

• Add 2 to both sides

• Subtract 2 from both sides

• Divide both sides by 2

• Multiply both sides by 2

Tags

CCSS.8.EE.A.2

What is the cube root of 64?

• 2

• 5

• 3

• 4

Tags

CCSS.8.EE.A.2

Why does a cube root equation have only one solution?

• Because multiplying three numbers always gives a positive result

• Because cube roots are always negative

• Because cube roots are always positive

• Because multiplying three negative numbers gives a negative result

Tags

CCSS.8.EE.A.2

What is the cube root of 1000?

• 10

• 9

• 11

• 8

Tags

CCSS.8.EE.A.2

Why can't you square root a negative number?

• Because it results in a complex number

• Because it results in a positive number

• Because it results in an undefined number

• Because it results in zero

What should be the last step when solving equations involving exponents?

• Add or subtract constants

• Multiply or divide by coefficients

• Square root or cube root

• Isolate the variable