(z-7)(z-7)=0

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Solution for (z-7)(z-7)=0 equation: 


Simplifying
(z + -7)(z + -7) = 0

Reorder the terms:
(-7 + z)(z + -7) = 0

Reorder the terms:
(-7 + z)(-7 + z) = 0

Multiply (-7 + z) * (-7 + z)
(-7(-7 + z) + z(-7 + z)) = 0
((-7 * -7 + z * -7) + z(-7 + z)) = 0
((49 + -7z) + z(-7 + z)) = 0
(49 + -7z + (-7 * z + z * z)) = 0
(49 + -7z + (-7z + z2)) = 0

Combine like terms: -7z + -7z = -14z
(49 + -14z + z2) = 0

Solving
49 + -14z + z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(7 + -1z)(7 + -1z) = 0


Subproblem 1
Set the factor '(7 + -1z)' equal to zero and attempt to solve:

Simplifying
7 + -1z = 0

Solving
7 + -1z = 0

Move all terms containing z to the left, all other terms to the right.

Add '-7' to each side of the equation.
7 + -7 + -1z = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1z = 0 + -7
-1z = 0 + -7

Combine like terms: 0 + -7 = -7
-1z = -7

Divide each side by '-1'.
z = 7

Simplifying
z = 7

Subproblem 2
Set the factor '(7 + -1z)' equal to zero and attempt to solve:

Simplifying
7 + -1z = 0

Solving
7 + -1z = 0

Move all terms containing z to the left, all other terms to the right.

Add '-7' to each side of the equation.
7 + -7 + -1z = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1z = 0 + -7
-1z = 0 + -7

Combine like terms: 0 + -7 = -7
-1z = -7

Divide each side by '-1'.
z = 7

Simplifying
z = 7
Solution
z = {7, 7}

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