You'll follow the formula perfectly, but the real trick is after you get the roots. Don't just round them. Write them first with three or four decimals, then draw a box and rewrite them with two. Examiner needs to see your steps. Lost half-mark in my ICSE because my final answer was directly from calculator's two-digit round-off, they called it "no working steps shown". Chai piyo, but double-check your rounding on paper.
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