x+9=4x^2+16

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Solution for x+9=4x^2+16 equation:


Simplifying
x + 9 = 4x2 + 16

Reorder the terms:
9 + x = 4x2 + 16

Reorder the terms:
9 + x = 16 + 4x2

Solving
9 + x = 16 + 4x2

Solving for variable 'x'.

Reorder the terms:
9 + -16 + x + -4x2 = 16 + 4x2 + -16 + -4x2

Combine like terms: 9 + -16 = -7
-7 + x + -4x2 = 16 + 4x2 + -16 + -4x2

Reorder the terms:
-7 + x + -4x2 = 16 + -16 + 4x2 + -4x2

Combine like terms: 16 + -16 = 0
-7 + x + -4x2 = 0 + 4x2 + -4x2
-7 + x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
-7 + x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
1.75 + -0.25x + x2 = 0

Move the constant term to the right:

Add '-1.75' to each side of the equation.
1.75 + -0.25x + -1.75 + x2 = 0 + -1.75

Reorder the terms:
1.75 + -1.75 + -0.25x + x2 = 0 + -1.75

Combine like terms: 1.75 + -1.75 = 0.00
0.00 + -0.25x + x2 = 0 + -1.75
-0.25x + x2 = 0 + -1.75

Combine like terms: 0 + -1.75 = -1.75
-0.25x + x2 = -1.75

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.25x + 0.25 + x2 = -1.75 + 0.25

Reorder the terms:
0.25 + -0.25x + x2 = -1.75 + 0.25

Combine like terms: -1.75 + 0.25 = -1.5
0.25 + -0.25x + x2 = -1.5

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -1.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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