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

ratio of sphers Area to Volume is
((( A=C*V^p )))
where
A=surface area
V=Volume
C=constant coefficient
P=constant power
What are the values of C and P
you can substitute The average rainfall is 25 inches 15% of this is collected on a watershed as surface runoffs. If the watershed area is 20 square miles. What is the average daily supply in million