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Question
Factorize `21x^2 - 2x + 1/21`
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Solution
`= (sqrt21x)^2 - 2 xx sqrt21x xx 1/sqrt21 + (1/sqrt21)^2`
Using idnetity `a^2 - 2ab + b^2 = (a - b)^2`
`= (sqrt21x - 1/sqrt21)^2`
`∴ 21x^2 - 2x + 1/21 = (sqrt21x - 1/sqrt21)^2`
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