Use your answer to part (b)(i) to solve the equation $$\(x^{2}+4 x+1=0\)$$. x= ............... or $$\(x=\)$$ ...............
Exam No：0580_s21_qp_43 Year：2021 Question No：7(b)(ii)
Answer:
\(
(x+2)^{2}=3
\)
\(-3.73\) or \(-3.732 \ldots\) and \(-0.268\) or \(-0.2679 \ldots\)
(x+2)^{2}=3
\)
\(-3.73\) or \(-3.732 \ldots\) and \(-0.268\) or \(-0.2679 \ldots\)
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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