4z(5z-2)=-15+6

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Solution for 4z(5z-2)=-15+6 equation:


Simplifying
4z(5z + -2) = -15 + 6

Reorder the terms:
4z(-2 + 5z) = -15 + 6
(-2 * 4z + 5z * 4z) = -15 + 6
(-8z + 20z2) = -15 + 6

Combine like terms: -15 + 6 = -9
-8z + 20z2 = -9

Solving
-8z + 20z2 = -9

Solving for variable 'z'.

Reorder the terms:
9 + -8z + 20z2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + -8z + 20z2 = 0

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

Divide each side by '20'.
0.45 + -0.4z + z2 = 0.0

Move the constant term to the right:

Add '-0.45' to each side of the equation.
0.45 + -0.4z + -0.45 + z2 = 0.0 + -0.45

Reorder the terms:
0.45 + -0.45 + -0.4z + z2 = 0.0 + -0.45

Combine like terms: 0.45 + -0.45 = 0.00
0.00 + -0.4z + z2 = 0.0 + -0.45
-0.4z + z2 = 0.0 + -0.45

Combine like terms: 0.0 + -0.45 = -0.45
-0.4z + z2 = -0.45

The z term is -0.4z.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4z + 0.04 + z2 = -0.45 + 0.04

Reorder the terms:
0.04 + -0.4z + z2 = -0.45 + 0.04

Combine like terms: -0.45 + 0.04 = -0.41
0.04 + -0.4z + z2 = -0.41

Factor a perfect square on the left side:
(z + -0.2)(z + -0.2) = -0.41

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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