Mathematics · Oct / Nov 2020 · Paper 42 · Question 10
0580
As printed in the paper
The question as text
( ) f x x 1 2 = + ( ) g x x 1 2 = - ( ) , h x x x 1 0 ! = ( ) j x 5x =
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Show the answer and mark scheme
10(a)(i)[1]
10 [1]
10(a)(ii)[1]
–19 [1]
FT 1 – 2 their (a)(i)
10(b)[2]
1 −x oe final answer 2 [2]
M1 for x = 1 – 2y or y + 2x = 1 or y 1 = − x 2 2 or y – 1 = –2x or better
10(c)[1]
1 2 oe [1]
10(d)[4]
4x2 – 8x + 2 final answer [4]
M1 for (1 – 2x)(1 – 2x) – (1– 2(1 – 2x)) or better
B1 for 1 – 2x – 2x + 4x2
B1 for – (1 – 2 + 4x) or better or [+] 1 – 4x or for correct answer seen then spoiled
10(e)[1]
x final answer [1]
10(f)[1]
3125 [1]
10(g)[1]
25 [1]
10(h)[2]
–2 [2]
B1 for 1 25 or 0.04
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