exam Maths Puzzle Numerical Ability

Find all real solutions to the equation.
the sqare root of x+4 minus 2 time the sqare root of x-1 = -1

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exam Other Question
The Acme printer company manufactures a laser printer made from 298 individual components. The printers were so designed tat the failure of one part does not affect the performance Expression 1: 2log(x+1)
Expression 2: 2log(2+x)
Expression 3: 4+log2+3logx

How would the sum of these 3 expressions be written as a single logarithm?

thanks in advance