College Algebra - Full Course

Evaluating Functions Let's work through this problem: f(x) = x² 2x - 4, Find f(-1) Step 1: Substitute -1 for x Replace every x in the function with -1. f(-1) = (-1)² 2(-1) - 4 Step 2: Evaluate the exponent Calculate (-1)² first, which equals 1. f(-1) = 1 2(-1) - 4 Step 3: Multiply Calculate 2(-1), which equals -2. f(-1) = 1 - 2 - 4 Step 4: Combine all terms Add and subtract from left to right. f(-1) = -5 The answer is f(-1) = -5. This means when x equals -1, the function's output is -5. #alldaye

Algebra Basics: Solving Basic Equations Part 1 - Math Antics