Using Logarithms to Solve Exponential Equations and Inequalities (VCE SSCE Mathematical Methods): Quizzes

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Using Logarithms to Solve Exponential Equations and Inequalities
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What is the logarithmic form of ax=ba^x = b?

log⁡ab=x\log_a b = x

Convert 2x=112^x = 11 to logarithmic form.

x=log⁡211x = \log_2 11

What is the change of base formula for log⁡ac\log_a c?

log⁡bclog⁡ba\frac{\log_b c}{\log_b a}

In change of base formula, what is the numerator?

Log of the number you're interested in

First step to solve 32x−1=283^{2x-1} = 28 is to:

Convert to logarithmic form

When base > 1 in inequality 2x≥52^x \geq 5, the direction:

Stays the same

When 0 < base < 1 in inequality, the direction:

Reverses

Why does log⁡100.7\log_{10} 0.7 cause inequality flip?

It is negative

To find x-intercept of f(x)=2×10x−4f(x) = 2 \times 10^x - 4, set:

f(x)=0f(x) = 0 and solve

Asymptote of f(x)=2×10x−4f(x) = 2 \times 10^x - 4 as x→−∞x \to -\infty:

y=−4y = -4

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