Which of the following mathematical expressions is equivalent to the verbal expression, "A number, x, squared is 39 more than the product of 10 and x?

"A number, x, squared is 39 more than the product of 10 and x."

"is" means equals, or can be written as =

"more than" mean addition, or +

"product of" means multiplication, or *

Now we have:

x^{2} = 39 + 10*x

x^{2} = 39 + 10x