UPSKILL MATH PLUS

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1. Using suitable identity, evaluate \(999^2=\)
 
2. Factorise: \(4x^2 + 20x + 25=\)
Answer variants:
\(998001\)
\((2x-5)(2x-5)\)
\(990401\)
\((2x+5)(2x+5)\)
\(994100\)
\((2x+5)(2x-5)\)