Answer:
[tex]49[/tex]
Step-by-step explanation:
[tex](a+b)^2=a^2+2ab+b^2[/tex] = Perfect square trinomial
25b^2+70b+* = [tex]25b^2+70b+*[/tex]
Our expression is:
[tex](5b+7)^2[/tex]
[tex](5b+7)(5b+7)[/tex]
[tex]25b^2+35b+35b+49[/tex]
[tex]25b^2+70b+49[/tex]
Hope this helps!
