How do you solve sqrt(10h)+1=21 and check your solution?

2 Answers
Jul 11, 2018

I tried this:

Explanation:

Let us rearrange it and write:

sqrt(10h)=21-1

sqrt(10h)=20

square both sides:

(sqrt(10h))^2=20^2

10h=400

and:

h=400/10=40

let us use this result in our original equation:

sqrt(10*40)+1=21

sqrt(400)+1=21

20+1=21 YES

Jul 11, 2018

h=40

Explanation:

sqrt(10h)+1=21

sqrt(10h)=20

10h=20^2

10h=400

h=40

To check your solution, sub h=40 back into your equation

LHS
=sqrt(10h)+1
=sqrt(10times40)+1
=20+1
=21
=RHS

Therefore, when h=40, the equation is true