book Maths Puzzle Numerical Ability

solve x^4-5x^2+6=0

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book Other Question

Show EACH step in solving each of the following equations. State if any solution is extraneous.
a. sqrt(3x + 1) = 4
b. 2x - sqrt(3x - 2) = 8
c. sqrt(2x - 1) = x - 8 I DONT UNDERSTAND THEM I NEED SOMEONE TO EXPIAN THEM..IN SIMPLE WORDS PLEASE!!!..ASAP