# How do you solve #x^2=90#?

##### 2 Answers

Jul 4, 2017

x=+-3

#### Explanation:

Taking the square root of any number gives you two answers, one positive and one negative e.g. -2 x -2 =4

Square root of 90 = square root of 9 x 10

You can root the 3 to give 3

Jul 4, 2017

#### Explanation:

Using the 'Principle square root'. That is, the positive one.

Square root both sides

Not that the decimal equivalent would be rounded and thus not as precise.