#### Mootjel

##### New member
Hey,

I have a 2 algebra sums I can not figure out ...

√2 * b * b = 1256 How can the answer be 105.1

And a other one: l = 1,5 * b | bring the 1.5 to the left gives b = 1 / 1.5 * l , how??
th g

and

How can the answer be b = 105.1?

How can the answer be b = 105.1?

Thank you for your help ...

#### Dr.Peterson

##### Elite Member
Hey,

I have a 2 algebra sums I can not figure out ...

√2 * b * b = 1256 How can the answer be 105.1

And a other one: l = 1,5 * b | bring the 1.5 to the left gives b = 1 / 1.5 * l , how??
th g

and

How can the answer be b = 105.1?
The answer to the first is not 105.1, as you can see by doing the check (substituting b with 105.1 and evaluating). Why do you think it is? Did you copy the equation exactly as given, or does what you typed look a little (or a lot) different?

In the second, they have multiplied both sides by the reciprocal of 1.5, namely 1/1.5; this is equivalent to dividing by 1.5.

#### Mootjel

##### New member
Thanks for your help. You're awesome dude! I wrote the first one wrong, they say that √2 * b * b = 15625 , gives somehow b = 105.1 But how?

#### Mootjel

##### New member
Thanks for your help dude, i wrote it wrong: √2 * b * b = 15 625 gives somehow b = 105.1

#### stapel

##### Super Moderator
Staff member
Thanks for your help. You're awesome dude! I wrote the first one wrong, they say that √2 * b * b = 15625 , gives somehow b = 105.1 But how?
What did you get when you divided through by the square root, and then solved the resulting quadratic by taking the square root of either side?