Mathematics for IGCSE & O level - Algebraic Manipulation (Section 7 - No. 1)
What do you need to check when factorizing expressions of the form ax² + bx + c?
Whether the expression contains a common factor.
If c is positive, find two numbers with the same sign that multiply to c and add to b.
If c is negative, find two numbers with different signs that multiply to c and add to b.
Whether the expression is a perfect square
Vysvětlení
Always check for a common factor and consider the sign of 'c' to determine the signs of the factors.