exam Maths Puzzle Numerical Ability



(x+3)(x-3)+(x+7))(x-3)=0

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I am having trouble finding the steps to solve this problem. 2Q^3 -11Q^2 -100=0. My text give me the answer of Q=6.64 but not the steps to solve it which I will need to solve other problems. Please help. Will someone please help me word this the right way? Thank you all so very much.
Systems of equations can be solved by graphing or by using substitution or elimination. What are