7a^2=-6a-18

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Solution for 7a^2=-6a-18 equation:


Simplifying
7a2 = -6a + -18

Reorder the terms:
7a2 = -18 + -6a

Solving
7a2 = -18 + -6a

Solving for variable 'a'.

Reorder the terms:
18 + 6a + 7a2 = -18 + -6a + 18 + 6a

Reorder the terms:
18 + 6a + 7a2 = -18 + 18 + -6a + 6a

Combine like terms: -18 + 18 = 0
18 + 6a + 7a2 = 0 + -6a + 6a
18 + 6a + 7a2 = -6a + 6a

Combine like terms: -6a + 6a = 0
18 + 6a + 7a2 = 0

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

Divide each side by '7'.
2.571428571 + 0.8571428571a + a2 = 0

Move the constant term to the right:

Add '-2.571428571' to each side of the equation.
2.571428571 + 0.8571428571a + -2.571428571 + a2 = 0 + -2.571428571

Reorder the terms:
2.571428571 + -2.571428571 + 0.8571428571a + a2 = 0 + -2.571428571

Combine like terms: 2.571428571 + -2.571428571 = 0.000000000
0.000000000 + 0.8571428571a + a2 = 0 + -2.571428571
0.8571428571a + a2 = 0 + -2.571428571

Combine like terms: 0 + -2.571428571 = -2.571428571
0.8571428571a + a2 = -2.571428571

The a term is 0.8571428571a.  Take half its coefficient (0.4285714286).
Square it (0.1836734694) and add it to both sides.

Add '0.1836734694' to each side of the equation.
0.8571428571a + 0.1836734694 + a2 = -2.571428571 + 0.1836734694

Reorder the terms:
0.1836734694 + 0.8571428571a + a2 = -2.571428571 + 0.1836734694

Combine like terms: -2.571428571 + 0.1836734694 = -2.3877551016
0.1836734694 + 0.8571428571a + a2 = -2.3877551016

Factor a perfect square on the left side:
(a + 0.4285714286)(a + 0.4285714286) = -2.3877551016

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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