What is the simplified form of the expression the quantity x squared minus 4x minus 21 end quantity divided by 4 times the quantity x minus 7 end quantity? the quantity x plus 3 end quantity divided by 4 the quantity x minus 3 end quantity divided by 4 the quantity x plus 3 end quantity divided by quantity x minus 7 end quantity the quantity x minus 3 end quantity divided by quantity x minus 7 end quantity.
