Verified answer

Answer:

[tex]a^{2} +ab+bc+ca-b^{2}[/tex]

a-1=5

a=1+5=6

a=6

b-2=3

b=5, c=2

[tex]6^{2} +(6)(5)+(5)(2)+(2)(6) - 5^{2}[/tex]

36+30+10+12-25

36+40+12-25

=63

Hope this helps you :))