Lesson 7.2: Cube roots Objectives: To determine the cube root of a number. To Solve a cube root equation. EQ: How do you evaluate a cube root expression?

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Presentation transcript:

Lesson 7.2: Cube roots Objectives: To determine the cube root of a number. To Solve a cube root equation. EQ: How do you evaluate a cube root expression?

Cube Roots: Unlike square roots where we look for a number multiplied by itself, cube roots have a number multiplied by itself and by itself again. EX: Evaluate Determine what number times itself and by itself again equals 8.

Ex: Evaluate = -4 =3 = -5 Cube roots can be negative, square roots can’t be negative.

Large Perfect Cubes You can use a factor tree to determine the cube root of a number

Solving cubic equations X = = 3

EX: Determine the side lengths of the cube. V = 27in x = 4 Side = 3inches