CP - Lesson: Solve Quadratic Equations (Pt 3)

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Solving Quadratic Equations (Part 3)

Objective: Solve quadratic equations.​

Math Response

Solve: 12x² - 54x = 0

One answer is 0, what is the other answer?

Type answer here

Correct Answer: \frac{9}{2}

Deg^°

Rad

Solving a Difference of Squares

​EXAMPLES

​x² - 36 = 0

​9x² - 49 = 0

Multiple Select

Solve: 25x² - 9 = 0

• $$x=\left\{5,-5\right\}$$

• $$x=\left\{\frac{9}{25},-\frac{9}{25}\right\}$$

• $$x=\left\{\frac{3}{5},-\frac{3}{5}\right\}$$

• $$x=\left\{3.-3\right\}$$

• $$x=\left\{\frac{5}{3},-\frac{5}{3}\right\}$$

Solving Perfect Squares

​EXAMPLES

​x² + 8x + 16 = 0

​x² - 16x + 64 = 0

Math Response

Solve: x² + 18x + 81 = 0

Type answer here

Correct Answer: -9

Deg^°

Rad

EXAMPLE

​6x³ - 8x² - 8x = 0

Multiple Select

Solve: 18x³ + 39x² - 15x = 0

One answer is 0, what are the other TWO answers?

• $$\frac{1}{3}$$

• $$-\frac{5}{2}$$

• $$-\frac{2}{5}$$

• $$-\frac{1}{3}$$

• $$\frac{5}{2}$$

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