Use your answer to part (a)(i) to solve the equation $$\(x^{2}+8 x-9=0\)$$. $$\[ x=. ............... or x= ............... \]$$
Exam No：0580_s20_qp_42 Year：2020 Question No：9(a)(ii)
Answer:
\(x+4=[\pm] 5\)
\(-9\) and 1
\(-9\) and 1
Knowledge points:
E2.5.4 Derive and solve quadratic equations by factorisation, completing the square and by use of the formula.
Solution:
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