exam Maths Puzzle Numerical Ability

If log a ≈ 0.250, then log a2 ≈
a. 0.125
b. 0.500
c. 0.017
d. 1.189

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exam Other Question

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

x^2+10x-8=0 Graph: f(x) = 2x + 2.

Thanks for any help you can provide.