exam Maths Puzzle Numerical Ability

If (x-1)^4+(x-5)^4-8=0

what is the value of

x^3+6x+2

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exam Other Question

please someone check this for me?

3x/x-7-21/x-7
3x-21/x-7
3(x-7)/x-7
3x-21/x-7 find the second coordinates of the points with first coordinates 0 and 1 of the following function f(x)=3(4)