Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 20)
When factoring a quadratic expression x² + bx + c, if both 'b' and 'c' are positive, what can you infer about the factors?
Both factors are positive.
Both factors are negative.
The factors have opposite signs.
Cannot be determined.
解释
For 'c' to be positive and 'b' to be positive, both factors must also be positive.