Question

Hi, please help me out :)) thank you

Answer 1

d = 32

Explanation:

`√(7d-1) -4+4=11+4`

`√(7d-1) =15`

`7d+1=15 *15`

`7d+1=225`

`7d=225-1`

`7d=224`

`d=(224)/(7)`

`d=32`

Answer 2

d =32

Explanation:

`√(7d+1)-4=11\\\\\mathrm{Add\:}4\mathrm{\:to\:both\:sides}\\√(7d+1)-4+4=11+4\\\\Simplify\\√(7d+1)=15\\\\\mathrm{Square\:both\:sides}:\quad 7d+1=225\\7d+1=225\\\\\mathrm{Solve\:}\:7d+1=225:\\\quad d=32`