Identify Functions from Equations (LEQA)

Which of the following best represents an linear function?

• y = x² - 4

• y = 2x - 4

• y = 10^x - 4

• $y=\sqrt{x}$

Answer explanation

Linear functions do not have exponents nor radicals in their equation.

Tags

CCSS.8.F.A.3

Which of the following best represents an exponential function?

• y = x² - 4

• y = |x+1|

• y = 10^x - 4

• $y=2\sqrt{x}$

Answer explanation

The exponent is an x, so this is an exponential function.

Which of the following best represents an quadratic function?

• y = x² - 4

• y = 2x - 4

• y = 10^x - 4

Answer explanation

The exponent is 2, so this is a quadratic function.

Tags

CCSS.8.F.A.3

What kind of function is y = x² + 3x - 4?

• Linear

• Absolute Value

• Quadratic

• Exponential

• None of the these

Answer explanation

The exponent is 2, so this is a quadratic function.

What kind of function is y = - 5x + 17?

• Linear

• Absolute Value

• Quadratic

• Exponential

• None of the these

Answer explanation

Linear functions do not have exponents nor radicals in their equation.

What kind of function is

f(x) = (0.5)^x + 5 ?

• Linear

• Absolute Value

• Quadratic

• Exponential

• None of the these

Answer explanation

The exponent is an x, so this is an exponential function.

What kind of function is

f(x) = 5|x-9|+ 2?

• Linear

• Absolute Value

• Quadratic

• Exponential

• None of the these

Answer explanation

The bars, | |, represents "absolute value". So this is an absolute value function.

What kind of function is f(x) = 5(x-9)² + 2?

• Linear

• Absolute Value

• Quadratic

• Exponential

• None of the these

Answer explanation

The exponent is 2, so this is a quadratic function.

What kind of function is f(x) = 5(9)^x + 2?

• Linear

• Absolute Value

• Quadratic

• Exponential

• None of the these

Answer explanation

The exponent is an x, so this is an exponential function.

What kind of function is f(x) = 5x + 2?

• Linear

• Absolute Value

• Quadratic

• Exponential

• None of the these

Answer explanation

Linear functions do not have exponents nor radicals in their equation.