(forty *x^ two /(one hundred - x^ two)^ two + twenty /(one hundred - x^ two))/(four hundred *x^ two /(one hundred - x^ two)^ two + one) = zero
(40 multiply by x squared divide by (100 minus x squared ) squared plus 20 divide by (100 minus x squared )) divide by (400 multiply by x squared divide by (100 minus x squared ) squared plus 1) equally 0
(forty multiply by x to the power of two divide by (one hundred minus x to the power of two) to the power of two plus twenty divide by (one hundred minus x to the power of two)) divide by (four hundred multiply by x to the power of two divide by (one hundred minus x to the power of two) to the power of two plus one) equally zero
(40*x to the power of 2/(100 - x to the power of 2) to the power of 2 + 20/(100 - x to the power of 2))/(400*x to the power of 2/(100 - x to the power of 2) to the power of 2 + 1) = 0