In the case of a 2 Ã 2 matrix, the specific formula for the determinant is simply the upper left element times the lower right element, minus the product of the other two elements.
Before you buy any extended warranty... An extended warranty should not be a rush purchase! Before buying any extended warranty, read the contract carefully. Be sure you understand what is and what is not covered, where you can have your car repaired, and whether there are any deductibles or limits on your coverage.emember, you do not need to purchase your extended warranty from the dealership. If your dealer tells you that you cannot obtain financing without buying an extended warranty or that you can only buy an extended warranty when you purchase the car, it's time to find a new dealer.
A fair profit margin for dealers is between $200 and $500 over their cost, says Weintraub. Here's another tip: When they're selling extended warranties with new cars, dealers often talk in terms of monthly payments, not the cost of the warranty itself.s with car insurance, you can choose extended warranty plans with different deductibles and levels of coverage. Generally speaking, most extended warranties offer three coverage levels. The first level pertains to the powertrain, while the second adds coverage for more components.