Limits by Direct Substitution Explained

What is the primary method discussed for finding limits in this video?

• Limits by direct substitution

• Infinite limits

• Graphical analysis

• L'Hôpital's Rule

Which types of functions can direct substitution be applied to?

• Only polynomial functions

• Only rational functions

• Both polynomial and rational functions, with conditions

• Exponential functions only

What does direct substitution in limits help to determine?

• The slope of the tangent line at a point

• The value of a function as x approaches a specific value

• The points of discontinuity

• The maximum value of a function

What is the limit of 3x - 2 as x approaches 2?

• 2

• 4

• 6

• 0

What is a crucial condition for applying direct substitution to rational functions?

• The numerator must be zero

• The function must be continuous

• The function must be differentiable

• The denominator cannot be zero

What is the limit of x^2 + x - 6 as x approaches -1?

• 2

• -3

• 0

• -6

For the function x^2 + x - 6 divided by x + 3, what must be checked before substituting x = -1?

• If the function is continuous at x = -1

• If the denominator equals zero

• If the limit exists

• If the numerator is zero

What is the result of the limit for the rational function x^2 + x - 6 over x + 3 as x approaches -1?

• 0

• -6

• -3

• 1

Why is it important to check the denominator in rational functions when applying direct substitution?

• To verify the limit exists

• To confirm the function is polynomial

• To avoid division by zero

• To ensure the function is differentiable

What is a key takeaway regarding the application of direct substitution for limits?

• It is not a valid method for finding limits

• It requires calculus techniques for every function

• It can only be used for linear functions

• It simplifies finding limits for complex functions