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1 of 8 0-day streak

Composition with an inverse and intersections of a function and its inverse

Question 1 of 8

No calculator

Solve the required equation algebraically and check the stated domain

The function \(q\) is defined by the rule

\[q(x)=2x+3\]

with domain \(\left[-7,\;1\right]\)

The inverse rule is

\[q^{-1}(x)=\frac{x-3}{2}\]

The domain of \(q^{-1}\) is \(\left[-11,\;5\right]\)

The composition to use is \(q^{-1}\left(q(x)\right)\). The probe input is \(-7\)

(a)2 marks

Simplify \(q^{-1}\left(q(x)\right)\) into the form \(Ax+B\). Enter the two coefficients

(b)1 mark

Evaluate \(q^{-1}\left(q(x)\right)\) at the probe input \(-7\)

Format: Give an exact value