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45 votes
45 votes
I cannot solve the equation.
√(7d+1)-4=11

User Keith Payne
by
3.4k points

2 Answers

23 votes
23 votes

Answer:

I believe the answer is d = 32

Explanation:

You should isolate the radical, then raise each side of the equation to the power of its index.

User Mhaddl
by
3.4k points
18 votes
18 votes

9514 1404 393

Answer:

d = 32

Explanation:

Add 4, then square, and solve the resulting linear equation.

√(7d +1) = 15

7d +1 = 225 . . . . . . square both sides

7d = 224 . . . . . . . . subtract 1

d = 32 . . . . . . . . . . divide by 7

User FET
by
2.7k points