exam Maths Puzzle Numerical Ability

hi,
solve by completing the square x^2-2x-7=0. can you please help me? thank you!!

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exam Other Question

3(5x-2)< x+8 The amount of a radioactive tracer remaining after t days is given
by A = A0 e-0.058t, where A0 is the starting amount at the beginning of
the time period. How many days will it take for one half of the
original amount to decay?