exam Maths Puzzle Numerical Ability

Solve the equation
3x^4-11x^2-20=0
81x^4=16
4x^3-8x^2-x+2=0

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exam Other Question

m-6=1/2(8-18m)

6b+2(b+1)=-14 A strong spring is mounted to a steel I-beam so that the spring hangs vertically. A weight is hung from the spring. The energy P (arbitrary units) stored in the spring is give