exam Maths Puzzle Numerical Ability

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?

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exam Other Question
can you please help me find the LCD of: (((3 over a, 3 over b, 1 over 5))) 9/4a=13

or 9 = 13 * 4a

or 9 = 52a

or 9 / 52 = a

2/7=x/3

or (2 /7) * 3 = x

or 6/7 = x


7x/8-1/4+3x/4=1/16+x