First Principles for Derivatives (HSC SSCE Mathematics Advanced): Quizzes

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First Principles for Derivatives
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What does the derivative of a function represent geometrically?

Gradient of tangent line at a point

What is the first principles formula for finding f(x)f'(x)?

limh0f(x+h)f(x)h\lim_{h \to 0} \frac{f(x+h) - f(x)}{h}

What does h0h \to 0 mean in the first principles formula?

As hh gets infinitely close to zero

What is the gradient of the secant line through P(x,f(x))P(x, f(x)) and Q(x+h,f(x+h))Q(x+h, f(x+h))?

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

What must you do before cancelling hh in the first principles method?

Factorise hh from the numerator

What is the correct expansion of (x+h)2(x+h)^2?

x2+2xh+h2x^2 + 2xh + h^2

Using first principles, what is the derivative of f(x)=3x+2f(x) = 3x + 2?

33

What is f(x)f'(x) for f(x)=x2+5xf(x) = x^2 + 5x using first principles?

2x+52x + 5

When should you substitute h=0h = 0 in the first principles process?

After cancelling the common factor hh

If f(x)=4x3f'(x) = 4x - 3, what is the gradient at x=3x = 3?

99

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