Mathematics · May / June 2020 · Paper 42 · Question 6
0580
As printed in the paper
The question as text
( ) f x x 3 2 = + ( ) g x x 1 2 = + ( ) h x 4x =
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
6(a)[1]
256 [1]
6(b)[2]
8 [2]
M1 for 3(x2 + 1) + 2 or for 3(2) + 2
6(c)[3]
9 x 2 + 12 x + 5 [3]
M1 for (3x + 2)2 + 1
B1 for [(3x + 2)2 =] 2 + + + 9 x 6 x 6 x 4 oe
6(d)[2]
16 [2]
M1 for 3x + 2 = 72 + 1 or better
6(e)[2]
x− 2 oe final answer 3 [2]
M1 for x = 3y + 2 or for y – 2 = 3x or for y 2 = + x 3 3
6(f)[3]
+ + 4 x 2 2 x 1 final answer 3 x + 2 [3]
B1 for x2 + 1 + x (3x + 2) or better seen
M1 for common denominator 3x + 2
6(g)[1]
16 [1]
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