(4+5i)(4-5i)=x

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


Simplifying
(4 + 5i)(4 + -5i) = x

Multiply (4 + 5i) * (4 + -5i)
(4(4 + -5i) + 5i * (4 + -5i)) = x
((4 * 4 + -5i * 4) + 5i * (4 + -5i)) = x
((16 + -20i) + 5i * (4 + -5i)) = x
(16 + -20i + (4 * 5i + -5i * 5i)) = x
(16 + -20i + (20i + -25i2)) = x

Combine like terms: -20i + 20i = 0
(16 + 0 + -25i2) = x
(16 + -25i2) = x

Solving
16 + -25i2 = x

Solving for variable 'i'.

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

Add '-16' to each side of the equation.
16 + -16 + -25i2 = -16 + x

Combine like terms: 16 + -16 = 0
0 + -25i2 = -16 + x
-25i2 = -16 + x

Divide each side by '-25'.
i2 = 0.64 + -0.04x

Simplifying
i2 = 0.64 + -0.04x

Reorder the terms:
-0.64 + i2 + 0.04x = 0.64 + -0.04x + -0.64 + 0.04x

Reorder the terms:
-0.64 + i2 + 0.04x = 0.64 + -0.64 + -0.04x + 0.04x

Combine like terms: 0.64 + -0.64 = 0.00
-0.64 + i2 + 0.04x = 0.00 + -0.04x + 0.04x
-0.64 + i2 + 0.04x = -0.04x + 0.04x

Combine like terms: -0.04x + 0.04x = 0.00
-0.64 + i2 + 0.04x = 0.00

The solution to this equation could not be determined.

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