Try using backticks (by the 1 key) instead of quotation marks. You can also type what you want into a desmos graph and copy/paste it into CL to have it auto-format.
You may also want to look into evaluative methods like:
#For (2x)^{5}
f3=simpleFunction(this.cellContent(1,3))
check3= f3.evaluteAt(1)=32 and f3.evaluateAt(0.5)=1