Foundation November 2019 Paper 3 Q22
22
(a) Expand and simplify \((x + 5)(x - 9)\) (2)
(b) Factorise fully \(9x^2 + 6x\) (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| \(x^2 - 4x - 45\) | M1 | for 3 of 4 terms correct or 4 terms correct ignoring signs |
| A1 | cao |
Additional guidance
3 terms correct can be implied, eg \(x^2 - 4x + c\)
| Answer | Mark | Mark scheme |
|---|---|---|
| \(3x(3x + 2)\) | B2 | for \(3x(3x + 2)\) |
| (B1 | for \(3(3x^2 + 2x)\) or \(x(9x + 6)\) or \(3x(ax + b)\) where \(a\) and \(b\) are integers or \((3x + 2)\) as a factor) |