book Maths Puzzle Numerical Ability

2m^-2+7m^-1-15=0

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book Other Question

[[4 -3]x-[[-1 1]=[[4 6]
[6 -2]] [5 7]] [8 2]]


Wrong question earlier...sorry.
Hi Tutors:
I am studying "Functions and Graphs." Can you please show me step by step how to find the domain? PROBLEM: f(x)=7/5-x (5-x is the denominator). Thanks in advance.