book Maths Puzzle Numerical Ability

Solution for x:

1 = sqrt(1-x^2)

What is the proper technique for solving x?

Thanks!

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factor: 14x^2+2 Hi I have not a clue how to do any of the proportions and I have a test this coming week! We have all of this proportions and tax-n-tip things and I feel as if I am the only one in