Algebra - Factorisation.
Summary of steps for the Cross-Method approach.
1. Write down the quadratic expression or equation. |
2. Draw a large X under the expression. |
3. Write x terms at the top and bottom on the left side of the X. |
4. Write factors of the constant term at the top and bottom on the right side of the X.
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5. Check the signs by reference to both the x term and the constant term. |
6. Check the cross multiplication to see if you obtain the required middle term with correct sign. |
7. Write down the factors you have developed. |
8. Smile at obtaining the correct factorisation. |