book Maths Puzzle Numerical Ability

Can you help me solve (((3x^4-28x^2+9=0)))

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book Other Question

Write the algebraic expression that corresponds to the sum of a number and 8. The Eiffel Tower is 497 ft taller than the Washington Monument. If
each of the monuments were 58 ft shorter, the Eiffel Tower would be twice as
tall as the Washington Monument.