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

The question is: Find the domain (the interval(s) on the real number line for which the radicand is nonnegative, greater than or equal to zero).
Squar root x-3

Thank you
Find the range:
y = 2x + 3 use {0, 1, 2, 3} as the domain