Vocabulary
What is a variable
A symbol that represents a number.
Solve: x + 3 < 7
x < 4
What is the domain?
All x-values.
Simplify: (x + 2) + (3x + 5)
4x + 7
What is a function?
A relation where each x has one y.
Solve: 2x ≥ 10
x ≥ 5
What is the range?
All y-values.
Simplify: (x + 3)(x + 2)
x² + 5x + 6
What is the vertex?
The highest or lowest point of a parabola.
Solve: -3x > 9
x < -3
Domain of y = 2x + 1
All real numbers.
Simplify: (2x²)(3x³)
6x⁵
What is a coefficient?
The number in front of a variable.
Graph x ≤ -2
Shade left of -2
Range of y = x²
y ≥ 0
Subtract: (4x² + 2x) - (x² + 5x)
3x² - 3x
What is the discriminant?
It tells how many real roots a quadratic has.
Solve: 4x - 7 ≤ 5
x ≤ 3
Domain of y = 1/(x - 2)
x ≠ 2
Divide: (x³ ÷ x)
x²