exam Maths Puzzle Numerical Ability

Find all real zeros of the function f(x)=x^4+x^2+12.
I know I`ve asked alot of questions lately, sorry dont hate me!

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exam Other Question

May I get some help on this problem?

Divide

8x^3 - 6x^2 + 2x/4x + 1

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if (6t+7a)/4=t, then what is 4t in terms of a?
the answer is -14a i would like to know how to get that answer.
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