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Grade 11 · Precalculus

Complex numbers

60 problems in this skill, each with a solver-verified answer key. Answers are checked the moment you submit — with a hint if you want one and a worked solution afterwards.

What the problems look like

A few statements from this skill. Answers, hints and worked solutions live in the practice session.

  1. Warm-up

    A quadratic equation with real coefficients has −2+4i-2 + 4i as one of its roots. Find the sum and the product of its two roots.

  2. Warm-up

    A quadratic equation with real coefficients has 2+9i2 + 9i as one of its roots. Find the sum and the product of its two roots.

  3. Warm-up

    A quadratic equation with real coefficients has 9+3i9 + 3i as one of its roots. Find the sum and the product of its two roots.

Problems shown under their original terms: Generated (template, solver-computed).

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See every Precalculus skill for grade 11