1MA0 Foundation June 2012 Paper 1 Q25
25
(a) Expand \(3(2y - 5)\) (1)
(b) Factorise completely \(8x^2 + 4xy\) (2)
(c) Make \(h\) the subject of the formula
\(t = \dfrac{gh}{10}\) (2)
\(t = \dfrac{gh}{10}\) (2)
| Answer | Mark | Notes |
|---|---|---|
| \(6y - 15\) | 1 | B1 cao |
| Answer | Mark | Notes |
|---|---|---|
| \(4x(2x + y)\) | 2 | B2 cao (B1 for \(x(8x + 4y)\) or \(2x(4x + 2y)\) or \(4(2x^2 + xy)\) or \(4x(ax + by)\) where \(a\), \(b\) are positive integers or \(ax(2x + y)\) where \(a\) is a positive integer or \(4x(2x\ \ y)\) ) |
| Working | Answer | Mark | Notes |
|---|---|---|---|
| \(10t = gh\) \(h = \dfrac{10t}{g}\) | \(\dfrac{10t}{g}\) | 2 | M1 for clear intention to multiply both sides of the equation by 10 (eg. \(\times 10\) seen on both sides of equation) or clear intention to divide both sides of the equation by \(g\) (eg. \(\div g\) seen on both sides of equation) or \(10t = gh\) or \(\dfrac{t}{g} = \dfrac{h}{10}\) or fully correct reverse flow diagram eg. \(\leftarrow \times 10 \leftarrow \div g \leftarrow\) A1 for \(\dfrac{10t}{g}\) oe |