exam Maths Puzzle Numerical Ability

problem: log (base 2) 35
This is what I have done:
log (base 2) (5 x 7)
log (base 2) 5 + log (base 2) 7
I do not know how to find the log base of 2 and the 5, and same for the base 2 and 7. On my TI-84 plus.

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