Help me plz? Plllz?

a). 11449 b). 39996 e). 996004

Explanation:

107^2
= (100+7)^2
= (100+7)(100+7)
= 10000 + 700 + 700+ 49
= 10000 + 1400 + 49
= 11449

198 x 202
= (200-2)(200+2)
= 40000 - 4
= 39996

998^2
= (1000-2)(1000-2)
= 1000000 - 2000 - 2000 + 4
= 1000000 - 4000 + 4
= 996000 + 4
= 996004

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,