exam Maths Puzzle Numerical Ability

I need help solving these questions please
4+square root 7 divided by 2
exponent4 suare root 27

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exam Other Question

Determine whether the following equations have a solution or not? Justify your answer.

x2 + 6x - 7 = 0

z2 + z + 1 = 0
Solve. X^2 = -6x.

I am having a hard time with this problem and need some help. thanks.