exam Maths Puzzle Numerical Ability

How can I Solve 25(2x+1)^2/9=0 ?

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If f(x)=3x 2nd power+2, then what is f(a+b)? 4. The Hudson River flows at a rate of 3 miles per hour. A patrol boat travels 60 miles upriver, and returns in a total time of 9 hours. What is the speed of the boat in still water?