12(2a-b)^2-23(2a-b)(a-2b)+10(a-2b)^2 factorise
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{12 × 2a - 12 × b}² - {23 ×2a - 23 × b × 23 × a - 23 × 2b} + {10 × a - 10 × 2b }²
= (24a - 12b)² - (46a - 529ab - 46b) + (10a - 20b)²
= 576a - 144b - 46a - 529ab - 46b + 100a - 400b
=576a - 46a + 100a - 144b - 46b - 400b -529ab
=630a - 590b - 529ab
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