need help

**ang15** · Oct 9th 2005, 07:04 AM

I have two problems that I'm not sure if I did them right.

The first one is:

Solve the equation: sqrt z = -1

my answer:

(sqrt z)^2 = -1^2

z= 1

The second one is:

Solve the equation: sqrt 2a = 2

my answer:

(sqrt 2a)^2 = 2^2

2a = 4

Please help me understand this eqations.

Thank you in advance.

**ctelady** · Oct 9th 2005, 07:54 AM

Solve the equation: sqrt z = -1

my answer:

(sqrt z)^2 = -1^2

z= 1

Excellent!

Solve the equation: sqrt 2a = 2

my answer:

(sqrt 2a)^2 = 2^2

2a = 4 Just complete the solution by dividing both sides by 2.

When one side of an eq is a SQRT, squaring both sides is the way to solve.
You're doing great.

**ang15** · Oct 9th 2005, 08:40 AM

Originally Posted by ctelady

Solve the equation: sqrt z = -1

my answer:

(sqrt z)^2 = -1^2

z= 1

Excellent!

Solve the equation: sqrt 2a = 2

my answer:

(sqrt 2a)^2 = 2^2

2a = 4 Just complete the solution by dividing both sides by 2.

When one side of an eq is a SQRT, squaring both sides is the way to solve.
You're doing great.

So, for the second equation my answer is going to be a=2 ?

**ctelady** · Oct 9th 2005, 08:48 AM

So, for the second equation my answer is going to be a=2 ?
Exactly right. Plug it back into the problem to check it.

**ang15** · Oct 9th 2005, 08:56 AM

Thank you for the help.

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