GED Math Extra Prep: Value Substitution
Value substitution questions on the GED Math test are fairly straightforward: they ask you to substitute actual numbers for variables in an expression and find the answer. The important thing to remember here is order of operations, or PEMDAS.
- What is the value of 6x – 3y2 when x = 12 and y = –5?
The next question is based on the following information.
- Which of the following expresses
in terms of p?
Answers and Explanations
- The correct answer is C.
Substitute the given values of x and y into the expression:
6x – 3y2 = 6(12) – 3(–5)2
Then use the correct order of operations to simplify: Remember PEMDAS — (Parentheses, then Exponents, then Multiplication and Division, and then Addition and Subtraction). So first evaluate the exponent, then perform the multiplication, and finally perform the subtraction:
Hence, Choice (C) is correct.
- The correct answer is B.
Any expression to the power zero equals 1. Hence, the correct answer is Choice (B).