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Mathematical Methods — Question 5

QCAA 2021, Paper 2 · 1 mark

Q5 · 2021 · Technology-activeSimple familiar1 mark

QUESTION 5

Solve for

x

given that

\log_3(x-1)=2

.

(A)

7

(B)

8

(C)

9

(D)

10

ABCD

Question linkOriginal paper

WORKED SOLUTION

Answer D

1 mark

ANSWER

D

Worked solution

x-1=3^2=9

, so

x=10

.

Selects option D.

[1 mark]

Worked explanation by QCE Vault; correct option verified against the QCAA answer key.

View the full QCAA marking guide

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