Write an expression for each of the following and then expand it.a A number, x, has 3 added to it and the result is multiplied by 5.b A number, b, has 6 added to it and the result is doubled.c A number, z, has 4 subtracted from it and the result is multiplied by 3.d A number, y, is subtracted from 10 and the result is multiplied by 7
Question
Write an expression for each of the following and then expand it.a A number, x, has 3 added to it and the result is multiplied by 5.b A number, b, has 6 added to it and the result is doubled.c A number, z, has 4 subtracted from it and the result is multiplied by 3.d A number, y, is subtracted from 10 and the result is multiplied by 7
Solution
a. The expression for "A number, x, has 3 added to it and the result is multiplied by 5" is 5*(x+3). When expanded, it becomes 5x + 15.
b. The expression for "A number, b, has 6 added to it and the result is doubled" is 2*(b+6). When expanded, it becomes 2b + 12.
c. The expression for "A number, z, has 4 subtracted from it and the result is multiplied by 3" is 3*(z-4). When expanded, it becomes 3z - 12.
d. The expression for "A number, y, is subtracted from 10 and the result is multiplied by 7" is 7*(10-y). When expanded, it becomes 70 - 7y.
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