It is "a squared minus eighteen b".
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To write a2-18b in verbal expression, you would say "the square of a minus 18 times b." This expression represents the square of a number a minus 18 times the variable b. The "a2" indicates that a is being squared, while the "18b" signifies 18 times b.
That is in verbal expression. x is the verbal, if you're trying to make it x times 2 in verbal expression it is as you wrote it 2x.
9and anumber and 2
The product of nine and a
Write an algebraic expression for the verbal expression. q squared minus 2 times q
X divided by Y