Question 4 - 16 marks You should use algebra in all parts of this question, showing your working clearly (a) Solve the f

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Question 4 16 Marks You Should Use Algebra In All Parts Of This Question Showing Your Working Clearly A Solve The F 1 (36.14 KiB) Viewed 33 times

Question 4 - 16 marks You should use algebra in all parts of this question, showing your working clearly (a) Solve the following equations, giving your answers as integers or as fractions in their simplest form. (i) 7+ 19 - 21 - 3. (ii) 14 - $19x - 2) = 8 +32 1 20 1 + 2 + 8 + (b) Factorise the expression ar? +130 – 68, and hence solve the equation + 13.1 - 68 = 0 (c) A student was asked to rearrange the formula d 100 - 26-d) to make d the subject (assuming that 1+14c 40). The student's incorrect attempt is shown below. 10.= 9-206-0) Clear the fractions By multiplying By 7 10 a = d-26-d) Multiply out the Bracket 70 a=d-12.0-2.cd Collect the d terms 10 a +120=d-2cd Factorise 10 a +126 = dl-20) Divide byl-2c to give 10 a +126 d = 1-20 (1) Write out a correct rearrangement of the formula. (ii) Identify and explain, as if directly to the student, two of the mistakes they have made.