Question

Question #2555b

Answer 1

(a^2-b^2) = (a+b)(a-b)#

`(7z-5)^2=25`

`rarr (7z-5)^2 -5^2 = 0`

`rarr ((7z-5)+5)((7z-5)-5)`

`rarr (7z)(7z-10)=0`

`z=0`
or
`z=(10)/7`