exam Maths Puzzle Numerical Ability

Solve:

x^4-6x+8=0

Hint: Let w=x^2

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exam Other Question

Please help!! write the equation of the root

-3/4, 8 thanks for the help.
If the first side is 4cm. longer than twice the second side, the third side is 2cm. shorter than the second side, and the perimeter is greater than 30 cm. , find one set of possibl