exam Maths Puzzle Numerical Ability

I am having problems with this one

x^2+7x-1=0

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exam Other Question

Use an augmented matrix to solve the linear system.
x+4y-2z=3 Step #1 [1 4 -2: 3]
x+3y+7z=1 [1 3 7 :1]
2x+9y+z=8 [2 9 1 :8]
Its asking to write the next term in sequence and then write a rule for the nth term. 1,10,100,1000,.... What would the nth term be?