Question

Please factorise it.................

Answer 1

${y}^{2} - 2ky + ky - 2 {k}^{2} \\ y(y - 2k) + k(y - 2k) \\ (y + k)(y -2 k)$

Answer 2

y² - ky - 2k²

= y² + ky - 2ky - 2k²

= y(y+k) - 2k(y+k)

=(y+k)(y-2k)

Either,

y+k=0

y= -k

Or,

y-2k= 0

y=2k

Hope it helps

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