book Maths Puzzle Numerical Ability

Please can I know the answer to this equation 4x2-5x+9=0.

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book Other Question

how many lines of symmetry does a pentagon have?
and how many does a rhombus have? Monica invested PHP 200,000 at a certain interest rate and PHP 300,000 at a rate 2/3 as high. If annual income from the two investments is PHP 36,000, find the interest rate of each investment.