Solving Quadratic Equations and Roots

The video tutorial explains how to solve quadratic equations using square roots. It begins by introducing the concept of solving quadratics without factoring, focusing on perfect squares. The first example demonstrates solving an equation with a perfect square on the left side, leading to two solutions. The second example applies the same technique to a different equation, highlighting the process of simplifying square roots and handling non-perfect squares. The tutorial concludes with a summary of the steps and solutions obtained.

Why do we avoid multiplying out the quadratic equation when using square roots?

• It changes the solutions.

• It makes the equation non-quadratic.

• It is unnecessary for this method.

• It makes the equation more complex.

Tags

CCSS.HSA-REI.B.4B

What is the first step in solving the equation (3x - 5)^2 = 4?

• Subtract 5 from both sides.

• Add 5 to both sides.

• Take the square root of both sides.

• Multiply both sides by 3.

Tags

CCSS.HSA-REI.B.4B

What does the equation (3x - 5)^2 = 4 simplify to after taking the square root of both sides?

• 3x - 5 = 0

• 3x - 5 = ±2

• 3x - 5 = 4

• 3x - 5 = ±4

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CCSS.8.EE.A.2

After adding 5 to both sides of the equation 3x - 5 = ±2, what is the next step?

• Take the square root of both sides.

• Subtract 5 from both sides.

• Divide both sides by 3.

• Multiply both sides by 3.

Tags

CCSS.HSA-REI.B.4B

What are the two solutions for the equation (3x - 5)^2 = 4?

• x = 5 and x = -5

• x = 7/3 and x = 1

• x = 3 and x = -3

• x = 2 and x = -2

Tags

CCSS.HSA-REI.B.4B

What is the first step in solving the equation (x + 3)^2 = 72?

• Add 3 to both sides.

• Subtract 3 from both sides.

• Multiply both sides by 2.

• Take the square root of both sides.

Tags

CCSS.HSA-REI.B.4B

What does the equation (x + 3)^2 = 72 simplify to after taking the square root of both sides?

• x + 3 = ±6

• x + 3 = ±72

• x + 3 = ±6√2

• x + 3 = ±36

Tags

CCSS.HSA-REI.B.4B

What is the next step after simplifying (x + 3)^2 = 72 to x + 3 = ±6√2?

• Add 3 to both sides.

• Multiply both sides by 2.

• Subtract 3 from both sides.

• Divide both sides by 2.

Tags

CCSS.HSA-REI.B.4B

What are the two solutions for the equation (x + 3)^2 = 72?

• x = 3 + 6√2 and x = 3 - 6√2

• x = -3 + 72 and x = -3 - 72

• x = -3 + 6√2 and x = -3 - 6√2

• x = 3 + 72 and x = 3 - 72

Tags

CCSS.HSA-REI.B.4B

Why can't the solutions for the equation (x + 3)^2 = 72 be simplified further?

• Because they are not like terms.

• Because they are irrational numbers.

• Because they are already in simplest form.

• Because they contain a radical.

Tags

CCSS.HSA-REI.B.4B