exam Maths Puzzle Numerical Ability

how can i factorize x^4 -3x^2+2 i dont understand this sum please help

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exam Other Question

this is a compound inequality:

x+2 is less or equal to 6
and
-2x is less than 10
A) Solve for x: and graph solution
5-2x>15

B) |4-x|<6

c) Solve without graphing
|2x-5|-4=6

d) |3x-1|+6=4

thankyou Brady