Find, in terms of $$\(k\)$$, the largest value of $$\(t\)$$ satisfying the inequality $$\[ \left|2^{t}+2 k\right| \geqslant\left|2^{t+1}-3 k\right| \text {. } \]$$ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics
IGCSE&ALevel
CAIE
Exam No:9709_m20_qp_22 Year:2020 Question No:5(c)

Answer:

Relate \(2^{t}\) to larger value of \(x\) from part (b)
Apply logarithms to obtain \(t=\frac{\ln (5 k)}{\ln 2}\)

Knowledge points:

2.2.3 use logarithms to solve equations and inequalities in which the unknown appears in indices

Solution:

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