Foundation November 2018 Paper 1 Q16

OCRFoundationCurrent spec4 marksSimplifying Basic Expressions

16 The perimeter of the pentagon is equal to the perimeter of the square.

Not to scale

Find an expression for the length of one side of the square.
Give your answer in terms of \(x\) in its simplest form. [4]

Mark scheme

Answer	Marks	Part marks and guidance
\(7x + 2\) final answer	4	B2 for \(28x + 8\) or B1 for \(28x + k\) or \(jx + 8\) or M1 for \(5x + 3 + 7x + 4 + 9x - 10 + 5x + 8 + 2x + 3\) AND M1 for their \((28x + 8) \div 4\) soi	\(j \ne 0\) B1 not from only one side e.g. \(5x + 8\) must be an algebraic expression in the form \(ax + b\)