exam Maths Puzzle Numerical Ability

can you please help me find the LCD of: (((3 over a, 3 over b, 1 over 5)))

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exam Other Question

how do you find a restriction for an equation? Find P(-1/2) if

P(x)=x^4+3x^2+2

(-1/2)x=x^4+3x^2+2? Is this right? and then I solve from there....How would I do this?