Factorisation - approaches to expressions with 4 terms.
Test Yourself 1.
| Common factor with grouping in pairs. | px - py - qx - qy
Answer.(x - y)(p - q). |
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| x2 + 3x + bx + 3b
Answer.(x + 3)(x + b). |
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| 3x - 3xz + 3y - 3yz
Answer.3(x + y)(1 - z). |
a3 + a2 - a - 1
Answer.(a2 - 1)(a - 1) = (a + 1)(a - 1)2. |
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| Factorise in pairs. | . 7x - y +49x2 - y2
Answer.(7x - y)(1 + 7x + y). |
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| x2 - y2 + 2x + 2y
Answer.(x + y)(x - y + 2). |
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| Quadratics and a single term. | x2 - 6x - y2 + 9
Answer.(x - 3 + y)(x - 3 - y). |
x2 |