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If x² + 6x + 2 = 0, which form is correct by completing the square?

Answer and explanation

Correct answer: (x + 3)² = 7

The governing concept is completing the square while preserving equality. Start with x² + 6x + 2 = 0 and move the constant term to the other side: x² + 6x = −2. Half the coefficient of x is 6/2 = 3, and its square is 9. Add 9 to both sides, not just one side: x² + 6x + 9 = −2 + 9. The left side becomes (x + 3)² and the right side becomes 7, so (x + 3)² = 7. Therefore option A is correct. Option B has the wrong sign inside the square, option C uses 6 instead of half of 6, and option D adds 9 incorrectly or fails to account for the moved constant.

Related tags

Quadratic EquationsCompleting The SquareAlgebraic ManipulationMethods Of Solving Quadratic EquationsMathematicsClass 10 Mcq

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