Find the zero(s) of $$ f(x)=8.53 x^{2}-9.81 x-5.69 $$ to three decimal places. If there is more than one zero, write all them on the same line, separated by commas.

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Solve the equation $$ 8.53x^{2}-9.81x-5.69=0 $$.
Solve the quadratic equation by following steps:
- step0: Solve using the quadratic formula:
  $$8.53x^{2}-9.81x-5.69=0$$
- step1: Convert the decimal into a fraction:
  $$\frac{853}{100}x^{2}-\frac{981}{100}x-\frac{569}{100}=0$$
- step2: Multiply both sides:
  $$100\left(\frac{853}{100}x^{2}-\frac{981}{100}x-\frac{569}{100}ight)=100	imes 0$$
- step3: Calculate:
  $$853x^{2}-981x-569=0$$
- step4: Solve using the quadratic formula:
  $$x=\frac{981\pm \sqrt{\left(-981ight)^{2}-4	imes 853\left(-569ight)}}{2	imes 853}$$
- step5: Simplify the expression:
  $$x=\frac{981\pm \sqrt{\left(-981ight)^{2}-4	imes 853\left(-569ight)}}{1706}$$
- step6: Simplify the expression:
  $$x=\frac{981\pm \sqrt{981^{2}+1941428}}{1706}$$
- step7: Separate into possible cases:
  $$\begin{align}&x=\frac{981+\sqrt{981^{2}+1941428}}{1706}\&x=\frac{981-\sqrt{981^{2}+1941428}}{1706}\end{align}$$
- step8: Rewrite:
  $$x_{1}=\frac{981-\sqrt{981^{2}+1941428}}{1706},x_{2}=\frac{981+\sqrt{981^{2}+1941428}}{1706}$$
The zeros of the function $$ f(x)=8.53x^{2}-9.81x-5.69 $$ to three decimal places are approximately -0.424 and 1.574.
The zeros of the function are approximately -0.424 and 1.574.

Find the zero(s) of to three
decimal places.
If there is more than one zero, write all them on the same
line, separated by commas.

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Find the zero(s) of to three decimal places. If there is more than one zero, write all them on the same line, separated by commas.