amyfc7
amyfc7
16-06-2019
Mathematics
contestada
factorise 49 a^2 + 4b^2 +9c^2 -28ab + 12bc- 42 ac
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NeilIceland
NeilIceland
16-06-2019
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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