1MA0 Higher June 2012 Paper 1 Q8
8
(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)
| 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. ×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. ← ×10 ← \(\div g\) ← A1 for \(\dfrac{10t}{g}\) oe |