exam Maths Puzzle Numerical Ability

Need to find all roots
f(x)=2x^2+5x-4 - based on rational root theorem!!!!!!!!!!!!!!!!!!!!!
HELP please
thanks

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exam Other Question

Find the GCF of the product.

(6y� - 3y)( y + 7) 2(t-3)+2=2(2t-6). The answer I got was -4, but the answer in the book is 4. What am I doing wrong. Could you please show me the distribution/elimination for this equation.

Thank you very much.