Question

(5+у)(5-у)-у(7-у) при у=3/7​

Answer 1

25- у^2-7у+у^2=25-7у

25-7×3/7=25-3=22

Answer 2

(5+y)(5-y)-y(7-y)=25-y^2-y7+y^2=

25-7y=22