Question

factorise: (998)2 + (994)2 – 1996 × 994

Answer 1

${(998)}^{2} + {(994)}^{2} - (1996 \times 994) \\ = {(998)}^{2} + {(994)}^{2} - (2 \times 998 \times 994) \\ = {(998 - 994)}^{2} \\ = {4}^{2} \\ = 4 \times 4$
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