ive reasons:
(a)It is not possible to construct ∆ABC,given that BC=7cm,Angle B=45° and AB-AC=10 cm
(b)Construction of ∆DEF,if EF=5.5cm,Angle E=75° and DE-DF=2cm is possible?
Here are the links for the answer to your query:
https://www.meritnation.com/ask-answer/question/is-it-possible-to-construct-triangle-abc-if-ab-7-cm-b-45-a/constructions/8837043
https://www.meritnation.com/ask-answer/question/give-reason-construction-of-triangle-def-is-possible-if-e/constructions/7210139
https://www.meritnation.com/ask-answer/question/is-it-possible-to-construct-triangle-abc-if-ab-7-cm-b-45-a/constructions/8837043
https://www.meritnation.com/ask-answer/question/give-reason-construction-of-triangle-def-is-possible-if-e/constructions/7210139