4MA0 Foundation January 2015 Paper 1R Q21
21 Solve \(\;3(x - 5) = 7x + 12\)
Show clear algebraic working.
(3)
| Scheme | Marks |
|---|---|
| \(3(x - 5) = 3x - 15\) \(3x - 15 = 7x + 12\) | M1 |
| \(-15 - 12 = 7x - 3x\) or \(3x - 7x = 12 + 15\) oe | M1 |
| −6.75 | A1 |
| (3) | |
| (3 marks) |
Notes
M1: For correct expansion of bracket (seen anywhere)
M1: correct rearrangement with \(x\) terms on one side and numbers on the other side
\(-15 - 12 = 7x - 3x\) or \(3x - 7x = 12 + 15\) or better
A1: Award 3 marks if M1 scored and answer correct, accept −6.75 oe