e same technique as in ( 4 and 5) above to factorise $$ x^{2}+3 x-4 $$

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Factor the expression $$ x^{2}+3x-4 $$.
Factor the expression by following steps:
- step0: Factor:
  $$x^{2}+3x-4$$
- step1: Rewrite the expression:
  $$x^{2}+\left(4-1ight)x-4$$
- step2: Calculate:
  $$x^{2}+4x-x-4$$
- step3: Rewrite the expression:
  $$x	imes x+x	imes 4-x-4$$
- step4: Factor the expression:
  $$x\left(x+4ight)-\left(x+4ight)$$
- step5: Factor the expression:
  $$\left(x-1ight)\left(x+4ight)$$
The expression $$x^{2}+3x-4$$ can be factored as $$(x-1)(x+4)$$.
$$ x^{2}+3x-4 = (x-1)(x+4) $$

e same technique as in ( 4 and 5) above to factorise

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