Mathematics for IGCSE & O level - Equations (Section 2 - No. 40)
When solving a quadratic equation by factorization, what should you do if 'c' is negative and you have an equation like x² + bx + c = 0?
Find two numbers with the same sign that multiply to give 'c' and add to give 'b'.
Find two numbers with different signs that multiply to give 'c' and add to give 'b'.
Find two numbers with the same sign that multiply to give 'b' and add to give 'c'.
Find two numbers with different signs that multiply to give 'b' and add to give 'c'.
Explanation
If 'c' is negative, find two numbers with different signs that multiply to give 'c' and add to give 'b'.