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Home > PC > Chapter 6 > Lesson 6.2.1 > Problem 6-75

6-75.
  1. Solve the following equations. Homework Help ✎

    1. x2 − 4x = 21

    2. (x − 2)(x + 1) = 4

    3. 3 +

1. Set everything = 0
2. Factor or use the quadratic formula.
3. How many answers should you have?

Set the entire function = 0.

Multiply each term by x2.

Square both sides first.