exam Maths Puzzle Numerical Ability

can i please have help to solve this?
(x-1)^2=5

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exam Other Question

9x + 2y + z = 4
3x + 3y - 4z = 5
2x - 2y + 4z = 1

Solve for x,y, and Z. My teacher wants us to augmented matrices, but I do not know how to solve that way. Solve the equation. Be sure to check your solution.
sqrt 2y+7 +4=4
sqrt 4x+1 +3=0

Thanks