Question

Why does -4i*i=4? what happens to the i when you multiply it

Answer 1

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As we know that :

• ${i}^{2} = i \times i = - 1$

so, over here

• $- 4i \times i$

• $- 4 {i}^{2}$

plugging the value of i² as -1

• $- 4 (- 1)$

• $4$