7a*a-12a+18=0

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Solution for 7a*a-12a+18=0 equation:


Simplifying
7a * a + -12a + 18 = 0

Multiply a * a
7a2 + -12a + 18 = 0

Reorder the terms:
18 + -12a + 7a2 = 0

Solving
18 + -12a + 7a2 = 0

Solving for variable 'a'.

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

Divide each side by '7'.
2.571428571 + -1.714285714a + a2 = 0

Move the constant term to the right:

Add '-2.571428571' to each side of the equation.
2.571428571 + -1.714285714a + -2.571428571 + a2 = 0 + -2.571428571

Reorder the terms:
2.571428571 + -2.571428571 + -1.714285714a + a2 = 0 + -2.571428571

Combine like terms: 2.571428571 + -2.571428571 = 0.000000000
0.000000000 + -1.714285714a + a2 = 0 + -2.571428571
-1.714285714a + a2 = 0 + -2.571428571

Combine like terms: 0 + -2.571428571 = -2.571428571
-1.714285714a + a2 = -2.571428571

The a term is -1.714285714a.  Take half its coefficient (-0.857142857).
Square it (0.7346938773) and add it to both sides.

Add '0.7346938773' to each side of the equation.
-1.714285714a + 0.7346938773 + a2 = -2.571428571 + 0.7346938773

Reorder the terms:
0.7346938773 + -1.714285714a + a2 = -2.571428571 + 0.7346938773

Combine like terms: -2.571428571 + 0.7346938773 = -1.8367346937
0.7346938773 + -1.714285714a + a2 = -1.8367346937

Factor a perfect square on the left side:
(a + -0.857142857)(a + -0.857142857) = -1.8367346937

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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