Rewrite the equation so that expression on one side could be graft in the X intercepts of the graph which other solutions to the equation

answer: the answer is   graph (a)

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."

jbankston is right, use thhe link and you should find the answer.