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Maths Puzzle
Numerical Ability
(5x -9)(5x - 7)
I understand that I have to use the FOIL system but I am confused on how it works. Would the answer be 25xsquared - 45x - 63? Thank you for your help.
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book Other Question
10x-3-2x=4
solve for x: 2x^2=13x+7