Evaluating a Variable Expression To evaluate a variable expression:

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Use the order of operations to evaluate expressions. Objective The student will be able to: Designed by Skip Tyler, Varina High School.

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Presentation transcript:

Evaluating a Variable Expression To evaluate a variable expression: substitute the given numbers for each variable. use order of operations to solve.

Example # 1 n + (13 - n)  5 for n = 8 = 8 + (13 - 8)  5 (Substitute.) = 8 + 5  5 (parentheses) = 8 + 1 (Divide l/r.) = 9 (Add l/r.)

Example # 2 8y - 3x2 + 2n for x = 5, y = 2, n =3 = 8  2 - 3  52 + 2  3 (Substitute.) = 8  2 - 3  25 + 2  3 (exponents) = 16 - 3  25 + 2  3 (Multiply l/r.) = 16 - 75 + 2  3 (Multiply l/r.) = 16 - 75 + 6 (Multiply l/r.) = -59 + 6 (Subtract l/r.) = -53 (Add l/r.)

Example # 3: What is the value of -10 – 4x if x = -13? -62 -42 42 52 Answer Now

Example # 4: What is the value of 5k3 if k = -4? -8000 -320 -60 320 Answer Now

Example # 5: What is the value of if n = -8, m = 4, and t = 2 ? 10 -10 -6 6 Answer Now