When a, b is what value, algebraic expression a2+b2+2a-4b+6 is the smallest value? What is the minimum value?

When a, b is what value, algebraic expression a2+b2+2a-4b+6 is the smallest value? What is the minimum value?

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Given that A, B are rational numbers, try to show that the value of A B -2A-4B+8 is positive

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