exam Maths Puzzle Numerical Ability

solve the quadratic equation:
(x+3)^2=81
please help thanks

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exam Other Question

if steven can mix 20 drinks in 5 minutes.sue can mix 20 drinks in 10 minutes. jack can mix 20 drinks in 15 minutes.how much time will it take all three of them working together to mix the 20 drinks i need help now