Mathematics · May / June 2021 · Paper 22 · Question 18
0580
As printed in the paper
The question as text
( ) f x x 25 2 = - ( ) g x x 4 = + Solve ( ) ( ) fg gf x x 1 + = . x = [4]
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
[x =] –2.1 oe [4]
M3 for x2 + 10x = x2 – 21 or better OR
M1 for (x + 1 + 4)2 – 25 or better
M1 for x2 – 25 + 4 or better If 0 scored
SC1 for answer 11 − oe 6
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