book Maths Puzzle Numerical Ability

solve for x:
x^4+x^2-12=0

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book Other Question

how do you do these types of equations?:

5-2(y+1)=21
A delivery boy collected $5.35 part in 5 cents and part in 10 cents. If the no. of 5 cents were 7 more than one-half the no. of 10 cents coin. How many 5 cents were there?

Please help me solve this assignment. Thanks.

John