exam Maths Puzzle Numerical Ability

I cant seem to get the right answer no matter how many times i try it

solve the equation by making appropriate substitution

(x)-2 - (8x)-1 + 10 = 0

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exam Other Question

This is the function equation

x 2 1 -1 -2 -4
y 12 48 48 12 3

What is the function? NO.1.How many number are there which consist of seven figures(digits)?

NO.2How many numbers not more than fours digits can be formed with 7,8,9?

I need these answers,today.Please help me....