4a3b - 44a2b +112. Factorise
2. Factorise
1.4x(b-c) + 2y(3b-3c) + 4z(2b-2c)
2.y2-(a+b)y+ab
3.x2 +y2 +x+y+2xy
3. Expand:
(2a-12)2
Given 5x-9y = 6 and xy = 3 find the value of 25x2 +81y2
If a+b+c=9 and ab+bc+ca = 40, find a2 +b2+c2
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