SAT Practice Math Questions: Absolute Value - dummies

# SAT Practice Math Questions: Absolute Value

Absolute value presents you with a number, letter, or expression inside of two lines. So what you do when one pops up in an equation on the SAT Math test? The following practice problems should point the way.

## Practice questions

1. In the equation |x – 4| = 3, x could equal
• A. 7 only
• B. 1 only
• C. 7 or 1
• D. 7 or –1
2. The solution set to the equation |x + 3| = 5 is
• A. {2}
• B. {2, –8}
• C. {–8}
• D. {–2, –8}

1. C. Because an absolute value symbol turns everything into a positive number, the expression inside the absolute value could equal either 3 or –3. This is the key to solving an equation with an absolute value. If |something| = n, then either something = n or something = –n. You must solve each of these equations separately to get two answers. But there’s a catch: You also must check each answer in the original equation. Only solutions that make the original equation true count in your final answer.