mathcally

5.13. Factorisation of 4 terms (not grouping)

N5. Algebraic expressions and formulae

(a) Factorise completely

    \[9b^2 - 6ab + a^2 - x^2\]

[2]

(b) Simplify

    \[ \frac {5}{2x^2 - 7x - 4} - \frac{8}{4-x} \]

[3]

In

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