You should memorize the times tables and then practice multiplying larger numbers with someone to help correct you work until you get more comfortable with it. In the mean time, use a calculator.
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You can, but it requires matrix arithmetic, so it is usually not taught when you first learn about vectors.
try to find two numbers that multiply to get that number. if you cant try to get something close to the same. then if one is an even number just divide it by 2 and multiply the other number by 2. keep doing this until you cant divide the number anymore. that should get you most of the factors
you cant. the quadratic function must be expressed as a number. Radicals and numbers dont mix
u cant because 19 is prime, but u can do 5+4+1x2=19.