exam Maths Puzzle Numerical Ability

Find all solutions to the equation y(2y+7)=15
Thanks in advance

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exam Other Question

I need help on a few problems. The first one I tried is (radical sign)x-6 +8=x
I started by subtracting 8, so I got (radical)x-6 =x-8, then I think you square each, and now I am 45 is what percent of 180?