Aim: How do we solve absolute value equations?

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Presentation transcript:

Aim: How do we solve absolute value equations? Do Now: Solve for x x + 4 = x – 1 2) √8 – x + 5 = 15 18 8 HW #3 – Chapter 1 pg 16 #9-14

Solving Absolute Value Equations Absolute value is denoted by the bars |3|. Absolute value represents the distance a number is from 0. Thus, it is always positive. |8| = 8 and |-8| = 8

Solving absolute value equations First, isolate the absolute value expression. Set up two equations to solve. For the first equation, drop the absolute value bars and solve the equation. For the second equation, drop the bars, negate the opposite side, and solve the equation. Always check the solutions.

Solve 6|5x + 2| = 312 6|5x + 2| = 312 |5x + 2| = 52 Isolate the absolute value expression by dividing by 6. 6|5x + 2| = 312 |5x + 2| = 52 Set up two equations to solve. 5x + 2 = 52 5x + 2 = -52 5x = 50 5x = -54 x = 10 or x = -10.8 Check: 6|5x + 2| = 312 6|5x + 2| = 312 6|5(10)+2| = 312 6|5(-10.8)+ 2| = 312 6|52| = 312 6|-52| = 312 312 = 312 312 = 312

Solve 3|x + 2| -7 = 14 3|x + 2| -7 = 14 3|x + 2| = 21 |x + 2| = 7 Isolate the absolute value expression by adding 7 and dividing by 3. 3|x + 2| -7 = 14 3|x + 2| = 21 |x + 2| = 7 Set up two equations to solve. x + 2 = 7 x + 2 = -7 x = 5 or x = -9 Check: 3|x + 2| - 7 = 14 3|x + 2| -7 = 14 3|5 + 2| - 7 = 14 3|-9+ 2| -7 = 14 3|7| - 7 = 14 3|-7| -7 = 14 21 - 7 = 14 21 - 7 = 14 14 = 14 14 = 14

Try These: 1) |4x - 3| + 2 = 7 2)|18 – 3y|= 9