Pls can someone show me how to get from

VA=IR*w-(λ*w2) and w*= IR2/2λ (IR2=IR squared)

to

VA*=IR2/4λ (IR2= squared)

and

VA*=w*IR/2

Many thanks

Pls can someone show me how to get from

VA=IR*w-(λ*w2) and w*= IR2/2λ (IR2=IR squared)

to

VA*=IR2/4λ (IR2= squared)

and

VA*=w*IR/2

Many thanks

just put w into the formula

VA

=IR* (IR/2λ)-[λ*(IR/2λ)^2]

=IR^2/2λ - IR^2/4λ

=IR^2/4 λ

Which can be rewritten as w*IR/2