book Maths Puzzle Numerical Ability

4x + 8 = �4

Is the answer -9
Thanks for any help

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book Other Question

Hello,
My Question is:
If an object is propelled vertically from the ground level with a velocity v, its height S in meters is described by the quadratic function
s(t)+-16tpowe Solve the logarithmic equation. Round the result to the three decimal places if necessary.

9log10 x - 4 = 11