Evaluating Algebraic Expressions
This worksheet helps 8th-grade students practice evaluating algebraic expressions by substituting given values for variables.
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Evaluating Algebraic Expressions
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Read each question carefully. Substitute the given values for the variables in each expression and then simplify to find the answer. Show your work.
1. Evaluate the expression 3x + 5 when x = 4.
2. Find the value of 7 - 2y when y = 3.
3. What is the value of a² + b when a = 5 and b = 10?
1. If m = 6, then 2m - 8 = .
2. When p = 2 and q = 5, the expression p(q + 3) equals .
3. The value of (k - 1)² when k = 7 is .
1. Evaluate 4(x - 2) + 3 when x = 5.
15
12
16
19
2. If a = 3 and b = -2, what is the value of a - b²?
-1
7
-5
-7
1. A rectangle has a length of (2w + 1) and a width of w. If w = 6 cm, what is the perimeter of the rectangle?
2. The formula for the area of a triangle is A = (1/2)bh. If the base (b) is 8 units and the height (h) is 10 units, what is the area?
1. If x = 2, then 5x - 3 = 7.
True
False
2. When a = -3, the expression a² + 4 equals 13.
True
False