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expand (x-1)(y+2)= xy-2x-y-2 or xy+2x-y-2 or any other answer
Richard Jensen On 3/08/14, Ahmad wrote: > expand (x-1)(y+2)= xy-2x-y-2 or xy+2x-y-2 or any other > answer

You have a classic binomial multiplying another binomial. A perfect example for "F O I L" So, multiply the "firsts" xy then multiply the "outsides" +2*x yielding +2x then the "insides" -1*y yielding -1y or -y then the "lasts" -1*+2 yielding -2 ...See More
Mar 8, 2014
mathdad On 3/08/14, Ahmad wrote: > expand (x-1)(y+2)= xy-2x-y-2 or xy+2x-y-2 or any other > answer Use the FOIL method. x times y = xy x times 2 = 2x -1 times y = -y -1 times 2 = -2 Put it all together. Answer: xy + 2x - y - 2
Mar 14, 2014


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