Mathematics for IGCSE & O level - Algebraic Manipulation (Section 1 - No. 50)
When factoring a quadratic expression ax² + bx + c, what are you looking for when 'c' is positive?
Two numbers that multiply to 'c'
Two numbers that add up to 'b'
Two numbers with the same sign
Two numbers with different signs
解释
If 'c' is positive, look for two numbers that multiply to 'c' and add up to 'b', which should have the same sign.