A square root is an exponent of one-half. A cube root is an exponent of one-third. Square roots of negative numbers do not have real number roots since the product of any real number and itself is positive. Cube roots do exist for negative numbers since the product of three negatives is a negative. Cube roots re-appear often in Geometry and in Algebra II.
Sample Problems (13)
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Solve x² − 2x − 8 = 0 using the quadratic formula.
Solve using the quadratic formula:
Solve x² − 2x + 2 = 0 using the quadratic formula.