exam Maths Puzzle Numerical Ability

Solve equation
x^2+2x+5=0
value of k that completes the square
x^2+10x+k

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exam Other Question

Someone, please help. When you simplify with a parenthesis, do you invert first. Thank you very much.

7(x^4)^5 (-4x^2)2 f(t)= log(t-5)