Factorise 49 a^2 + 4b^2 +9c^2 -28ab + 12bc- 42 ac

1 answer:

3 0

49a^2 + 4b^2 + 9c^2 -28ab + 12bc- 42ac

= (7a)^2 + (-2b)^2 + (-3c)^2 + (2*7a*-2b) + (2*-2b*-3c) + (2*-3c*7a)

=(7a - 2b - 3c)^2 (Answer)

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