Solve $$\(x^{3}+4 x^{2}-17 x=x^{3}-9\)$$. You must show all your working and give your answers correct to 2 decimal places. x= .................... or $$\(x=\)$$ ....................
Exam No：0580_w21_qp_41 Year：2021 Question No：4(c)
Answer:
\(
\begin{array}{l}
4 x^{2}-17 x+9[=0] \text { oe } \\
\frac{[--] 17 \pm \sqrt{([-] 17)^{2}-4(4)(9)}}{2 \times 4}
\end{array}
\)
\(0.62\) and \(3.63\) cao
\begin{array}{l}
4 x^{2}-17 x+9[=0] \text { oe } \\
\frac{[--] 17 \pm \sqrt{([-] 17)^{2}-4(4)(9)}}{2 \times 4}
\end{array}
\)
\(0.62\) and \(3.63\) cao
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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