From: Andrew Lorimer Date: Mon, 25 Mar 2019 11:08:24 +0000 (+1100) Subject: Merge branch 'master' of ssh://charles/tank/andrew/school/notes X-Git-Tag: yr12~185 X-Git-Url: https://git.lorimer.id.au/notes.git/diff_plain/2e3b4eae42f5477f127dfdba183701b5d808665a?hp=79c757d262f3680e96db74a6d07ac7402d8aae0b Merge branch 'master' of ssh://charles/tank/andrew/school/notes --- diff --git a/methods/graphics/exponential-graphs.png b/methods/graphics/exponential-graphs.png new file mode 100644 index 0000000..ff04936 Binary files /dev/null and b/methods/graphics/exponential-graphs.png differ diff --git a/methods/graphics/log-graphs.png b/methods/graphics/log-graphs.png new file mode 100644 index 0000000..e9e55bb Binary files /dev/null and b/methods/graphics/log-graphs.png differ diff --git a/methods/stuff.md b/methods/stuff.md index cd3aeb0..2055b63 100644 --- a/methods/stuff.md +++ b/methods/stuff.md @@ -1,5 +1,5 @@ --- -geometry: margin=2cm +geometry: margin=1.5cm graphics: yes tables: yes @@ -41,7 +41,6 @@ If $a<1, \quad \log_{b} a < 0$ (flip inequality operator) $e^x$ - natural exponential function - $$\lim_{h \rightarrow 0} {{e^h-1} \over h}=1$$ ## Logarithm laws @@ -65,10 +64,6 @@ $$f^{-1}: \mathbb{R}^+ \rightarrow \mathbb{R}, f^{-1}=log_ax$$ $$e= \lim_{n \rightarrow \infty} (1 + {1 \over n})^n$$ -## Literal equations - -_Literal equation_ - no numerical solutions - ## Exponential and logarithmic modelling $$A = A_0 e^{kt}$$ @@ -91,9 +86,11 @@ $$f(x)=Aa^{k(x-b)} + c, \quad \vert \> a > 1$$ - dilation of factor $A$ from $x$-axis - dilation of factor $1 \over k$ from $y$-axis +![](graphics/exponential-graphs.png){#id .class width=30%} + ## Graphing logarithmic functions -$log_e x$ is the inverse of $e^x$ (reflection across $y=x$) +$\log_e x$ is the inverse of $e^x$ (reflection across $y=x$) $$f(x)=A \log_a k(x-b) + c$$ @@ -106,6 +103,8 @@ where - dilation of factor $A$ from $x$-axis - dilation of factor $1 \over k$ from $y$-axis +![](graphics/log-graphs.png){#id .class width=30%} + ## Finding equations Solve simultaneous equations on CAS: ![](graphics/cas-simultaneous.png){#id .class width=75px} diff --git a/methods/stuff.pdf b/methods/stuff.pdf index 0608c54..2de4e75 100644 Binary files a/methods/stuff.pdf and b/methods/stuff.pdf differ