Math, asked by 4175Dhruv, 8 months ago

please help me to solve this please fast

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Answered by DIVDARSH

1

a^2+b^2+c^2-bc-ca-ab

------->(2)^2+(-1)^2+(4)^2-(-1)(4)-(4)(2)-(2)(-1)

------->4+1+16-(-4)-8-(-2)

------->4+1+16+4-8+2

------->5+20-8+2

------->27-8

------->19

HOPE THIS HELP YOU OUT

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