$$\[ \mathrm{f}(x)=4 x-1 \quad \mathrm{~g}(x)=x^{2} \quad \mathrm{~h}(x)=3^{-x} \]$$ Use the quadratic formula to solve $$\(9 x^{2}-12 x-23=0\)$$. Give your answers correct to 2 decimal places. $$\[ x= ........................ or x= ........................ \]$$
Exam No：0580_m20_qp_42 Year：2020 Question No：10(d)(ii)
Answer:
\(\frac{-(-12) \pm \sqrt{(-12)^{2}-4(9)(-23)}}{2 \times 9}\)
or better
\(-1.07,2.40\) final answers
or better
\(-1.07,2.40\) final answers
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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