Gradient of a Curve (HSC SSCE Mathematics Advanced): Quizzes

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Gradient of a Curve
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What formula calculates the gradient of a line through points A(x1,y1)A(x_1, y_1) and B(x2,y2)B(x_2, y_2)?

m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1}

Why can't a single gradient value describe an entire curve?

The steepness changes at different points

What is a tangent to a curve?

A line touching the curve at exactly one point

How is the gradient of a curve at a point defined?

As the gradient of the tangent at that point

What is the gradient of a curve when its tangent is horizontal?

Zero

What is a secant line?

A line through two points on the curve

What is the formula for the gradient of a secant through P(c,f(c))P(c, f(c)) and Q(c+h,f(c+h))Q(c + h, f(c + h))?

f(c+h)f(c)h\frac{f(c + h) - f(c)}{h}

What happens to the secant gradient as hh approaches zero?

It approaches the tangent gradient

Which notation represents the derivative of f(x)f(x)?

f(x)f'(x)

If f(x)=3x+2f'(x) = 3x + 2, what is the gradient of the tangent to y=f(x)y = f(x) at x=4x = 4?

14

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