4x(x-3)+5(x+3)=0

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Solution for 4x(x-3)+5(x+3)=0 equation:


Simplifying
4x(x + -3) + 5(x + 3) = 0

Reorder the terms:
4x(-3 + x) + 5(x + 3) = 0
(-3 * 4x + x * 4x) + 5(x + 3) = 0
(-12x + 4x2) + 5(x + 3) = 0

Reorder the terms:
-12x + 4x2 + 5(3 + x) = 0
-12x + 4x2 + (3 * 5 + x * 5) = 0
-12x + 4x2 + (15 + 5x) = 0

Reorder the terms:
15 + -12x + 5x + 4x2 = 0

Combine like terms: -12x + 5x = -7x
15 + -7x + 4x2 = 0

Solving
15 + -7x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
3.75 + -1.75x + x2 = 0

Move the constant term to the right:

Add '-3.75' to each side of the equation.
3.75 + -1.75x + -3.75 + x2 = 0 + -3.75

Reorder the terms:
3.75 + -3.75 + -1.75x + x2 = 0 + -3.75

Combine like terms: 3.75 + -3.75 = 0.00
0.00 + -1.75x + x2 = 0 + -3.75
-1.75x + x2 = 0 + -3.75

Combine like terms: 0 + -3.75 = -3.75
-1.75x + x2 = -3.75

The x term is -1.75x.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75x + 0.765625 + x2 = -3.75 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = -3.75 + 0.765625

Combine like terms: -3.75 + 0.765625 = -2.984375
0.765625 + -1.75x + x2 = -2.984375

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = -2.984375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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