Question 971340

 a. {{{30}}}, {{{10}}}=> the product is {{{30*10=300}}}
 b. {{{10}}}, {{{-10}}}=> the product is {{{10*(-10)=-100}}}
 c. {{{-5}}}, {{{-25}}}=> the product is {{{(-5)*(-25)=125}}}
 d. {{{25}}},{{{ 5}}}=> the product is {{{25*5=125}}}


so, answer is:

b. {{{10}}}, {{{-10}}} because the product is {{{-100}}}