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grade 11 · A2-007

Find complex quadratic roots

Interpret a negative radicand with i and keep both square-root branches.

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Show what I knowFresh problem · seed 93404270

Solve \(x^2+81=0\).

√(−81)→two roots?

Choose an answer\(x=\pm 9\)\(x=9i\)\(x=\pm 81i\)\(x=\pm 9i\)

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Math Lab is a working name for Ready Rung's separate math-learning product. Guided success and independent evidence are reported separately.