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Completing the Square Objective: To complete a square for a quadratic equation and solve by completing the square
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Steps to complete the square
1.) You will get an expression that looks like this: ax²+ bx 2.) Our goal is to make a square such that we have (a + b)² = a² +2ab + b² 3.) We take ½ of the X coefficient (Divide the number in front of the x by 2) 4.) Then square that number
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To Complete the Square x2 + 6x
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Complete the square, and show what the perfect square is:
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Steps to solve by completing the square
1.) If the quadratic does not factor, move the constant to the other side of the equation Ex: x²-4x -7 = x²-4x=7 2.) Work with the x²+ x side of the equation and complete the square by taking ½ of the coefficient of x and squaring Ex. x² -4x /2= 2²=4 3.) Add the number you got to complete the square to both sides of the equation Ex: x² -4x +4 = 7 +4 4.)Simplify your trinomial square Ex: (x-2)² =11 5.)Take the square root of both sides of the equation Ex: x-2 =±√11 6.) Solve for x Ex: x=2±√11
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Solve by Completing the Square
+9
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Solve by Completing the Square
+121
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Solve by Completing the Square
+1
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Solve by Completing the Square
+25
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Solve by Completing the Square
+16
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Solve by Completing the Square
+9
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The coefficient of x2 must be “1”
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The coefficient of x2 must be “1”
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