exam Maths Puzzle Numerical Ability

Could you please help me solve this by completing the square:

x^2+10x-8=0

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exam Other Question

1/a + 1/x = 1/b
solve for x. how would you do this. thank you
If log a ≈ 0.250, then log a2 ≈
a. 0.125
b. 0.500
c. 0.017
d. 1.189