book Maths Puzzle Numerical Ability

looking desperately for the answer to this:

6x to the second power - 12x - 18 = ????

Please help... thank you, krista m pooler

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book Other Question
A rectangular room has an area of 170.5 square feet and a perimeter of 53 feet. What are its dimensions? please help !
i have $10,000.00 -part at4% and part at5% simple intrest for 1 year.
how much was invested in each account if the 5% was $320.00 grater than the4%
thank you for y