What is expand (x+isqrt(i))(x-isqrt(i)) ?

The solution to expand (x+isqrt(i))(x-isqrt(i)) is x^2+i

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expand (x+isqrt(i))(x-isqrt(i))

expand

(x + i i) (x - i i)

x^{2} + i

Solution steps

(x + i i) (x - i i)

Apply Difference of Two Squares Formula:

(a + b) (a - b) = a^{2} - b^{2}

a = x, b = i i

= x^{2} - (i i)^{2}

Simplify

x^{2} - (i i)^{2} : x^{2} + i

= x^{2} + i

72 (e^{6 t} - e^{- 6 t})^{2}

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What is expand (x+isqrt(i))(x-isqrt(i)) ?
The solution to expand (x+isqrt(i))(x-isqrt(i)) is x^2+i