book Maths Puzzle Numerical Ability

Please help me solve this equation: {{{ 4x^2-3x+6=0 }}}.

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book Other Question

solve for r:1/8(r+3)=6.
If you can help to solve it also as subtraction.
Thank you, it will a big help The sum of the squares of two consecutive integers is 13. Find the integers and explain your steps as you solve.