7(3x)+8(5x)-3x^2=364

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Solution for 7(3x)+8(5x)-3x^2=364 equation:


Simplifying
7(3x) + 8(5x) + -3x2 = 364

Remove parenthesis around (3x)
7 * 3x + 8(5x) + -3x2 = 364

Multiply 7 * 3
21x + 8(5x) + -3x2 = 364

Remove parenthesis around (5x)
21x + 8 * 5x + -3x2 = 364

Multiply 8 * 5
21x + 40x + -3x2 = 364

Combine like terms: 21x + 40x = 61x
61x + -3x2 = 364

Solving
61x + -3x2 = 364

Solving for variable 'x'.

Reorder the terms:
-364 + 61x + -3x2 = 364 + -364

Combine like terms: 364 + -364 = 0
-364 + 61x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
121.3333333 + -20.33333333x + x2 = 0

Move the constant term to the right:

Add '-121.3333333' to each side of the equation.
121.3333333 + -20.33333333x + -121.3333333 + x2 = 0 + -121.3333333

Reorder the terms:
121.3333333 + -121.3333333 + -20.33333333x + x2 = 0 + -121.3333333

Combine like terms: 121.3333333 + -121.3333333 = 0.0000000
0.0000000 + -20.33333333x + x2 = 0 + -121.3333333
-20.33333333x + x2 = 0 + -121.3333333

Combine like terms: 0 + -121.3333333 = -121.3333333
-20.33333333x + x2 = -121.3333333

The x term is -20.33333333x.  Take half its coefficient (-10.16666667).
Square it (103.3611112) and add it to both sides.

Add '103.3611112' to each side of the equation.
-20.33333333x + 103.3611112 + x2 = -121.3333333 + 103.3611112

Reorder the terms:
103.3611112 + -20.33333333x + x2 = -121.3333333 + 103.3611112

Combine like terms: -121.3333333 + 103.3611112 = -17.9722221
103.3611112 + -20.33333333x + x2 = -17.9722221

Factor a perfect square on the left side:
(x + -10.16666667)(x + -10.16666667) = -17.9722221

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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