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Write the equation in standard form for the circle x2+y24x+7=0x^2+y^2-4x+7= 0.

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Q. Write the equation in standard form for the circle x2+y24x+7=0x^2+y^2-4x+7= 0.
  1. Identify equation and need: Identify the given equation and the need to complete the square for xx.\newlineThe given equation is x2+y24x+7=0x^2 + y^2 - 4x + 7 = 0. To get it into standard form, we need to complete the square for the xx terms.
  2. Group and leave space: Group the xx terms and leave a space for completing the square.x24x+( )+y2=7x^2 - 4x + (\ ) + y^2 = -7We will add a certain number inside the parentheses to complete the square for the xx terms.
  3. Calculate number to complete: Calculate the number needed to complete the square for the x terms.\newlineTo complete the square, we take the coefficient of x, which is 4-4, divide it by 22, and square it. (4/2)2=4(-4/2)^2 = 4.\newlineAdd 44 inside the parentheses to complete the square for the x terms.
  4. Add number to both sides: Add the same number to both sides of the equation to maintain equality.\newlinex24x+4+y2=7+4x^2 - 4x + 4 + y^2 = -7 + 4\newlineNow the equation is balanced.
  5. Factor and simplify: Factor the completed square for the x terms and simplify the right side of the equation.\newline(x2)2+y2=3(x - 2)^2 + y^2 = -3\newlineThis is the equation with the x terms factored.
  6. Ensure positive right side: Since the standard form of a circle's equation is (xh)2+(yk)2=r2(x - h)^2 + (y - k)^2 = r^2, we need to ensure the right side of the equation is positive because the radius squared must be a positive number.\newlineHowever, we have a negative number on the right side, which indicates a math error. A circle cannot have a negative radius squared.

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