book Maths Puzzle Numerical Ability

I don't understand Factoring Trinomials. Can you show me step-by-step how to get the answer to this problem: {{{2b^2+10b+12}}}

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solve listing any restrictions
x/x^2+5x-14 +2/x-2 =1/x+7


does x = -8
The sales price of a car is $12,590, which is 20% off the original price. What is the original price?
I am having a hard time putting this on paper, can you help?