exam Maths Puzzle Numerical Ability

Please help me find the real and imaginary zeros to:
U(x)=x^4-4x^3+x^2+12x-12. Thanks.

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exam Other Question

HELP!!!!

Rewrite the equation as a function of x

y=-7x-9

thanks a lot
Heather Please help me solve this problem

3^x+4=5^x-1

(x+4)log3=(x-1)log5

xlog3+4log3=xlog5-1log5

4log3+1log5=xlog3-xlog5

x=4*0.47712+1*0.69897/0.69897-0.47712