Beginning Algebra
Which expression is the definition of the imaginary unit ii?
Simplify −9\(\sqrt{-9}\).
Given z=−1+2iz = -1 + 2i, compute the magnitude ∣z∣|z|.
Simplify the expression −18+2i\(\sqrt{-18}\)+2i and express your answer in standard form a+bia + bi.
Simplify −72\(\sqrt{-72}\) fully, extracting perfect-square factors and following notation conventions.
