3. Find all real numbers x, y and z which satisfy the simultaneous
advised to concentrate on these problems first.
equations x
2− 4y + 7 = 0, y
2− 6z + 14 = 0 and z
2− 2x − 7 = 0.
• The use of rulers, set squares and compasses
is allowed, but calculators and protractors are
forbidden.
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