reference book for methods

diff --git a/methods/polynomials-ref.pdf b/methods/polynomials-ref.pdf
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diff --git a/methods/polynomials.md b/methods/polynomials.md
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--- a/methods/polynomials.md
+++ b/methods/polynomials.md
@@ -1,3 +1,7 @@
+---
+geometry: margin=1.5cm
+---
+
 # Polynomials
 
 ## Factorising
@@ -59,7 +63,7 @@ Equations with multiple pronumerals. Solutions are expressed in terms of pronume
 - **Infinitely many solutions** - lines are equal
 - **No solution** - lines are parallel
 
-### Solving $\begin{cases}px + qy = a \\ rx + sy = b\end{cases}$ for one, infinite and no solutions
+### Solving $\protect\begin{cases}px + qy = a \\ rx + sy = b\protect\end{cases}$ for one, infinite and no solutions
 
 where all coefficients are known except for one, and $a, b$ are known
 
@@ -79,9 +83,9 @@ where all coefficients are known except for one, and $a, b$ are known
 
 Or use Matrix -> `det` on CAS.
 
-### Solving $\begin{cases}a_1 x + b_1 y + c_1 z = d_1 \\
+### Solving $\protect\begin{cases}a_1 x + b_1 y + c_1 z = d_1 \\
 a_2 x + b_2 y + c_2 z = d_2 \\
-a_3 x + b_3 y + c_3 z = d_3\end{cases}$
+a_3 x + b_3 y + c_3 z = d_3\protect\end{cases}$
 
 - Use elimination
 - Generate two new equations with only two variables

diff --git a/methods/transformations-ref.pdf b/methods/transformations-ref.pdf
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