If a=x+y, b=x-y, c=x+2y, then $$ {a^2+b^2+c^2}-ab-bc-ca $$ is
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Q:
If a=x+y, b=x-y, c=x+2y, then $$ {a^2+b^2+c^2}-ab-bc-ca $$ is
- 1$${4y^2}$$false
- 2$${5y^2}$$false
- 3$${6y^2}$$false
- 4$${7y^2}$$true
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