book Maths Puzzle Numerical Ability

factor: 14x^2+2

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book Other Question

can you please help with this question...

Joseph is 4 years older than twice his sisters age. In 4 years time he will be 11 years older than here. How old is Joseph now
Solution for x:

1 = sqrt(1-x^2)

What is the proper technique for solving x?

Thanks!