Question

How do you solve `100x^2 = 121`?

Answer 1

`x = +11/10 or x = -11/10`

Explanation:

The general rule for solving a quadratic equation `(x^2")` is to make it equal to 0.
However this case is the exception because there is no term in `x`.

`100x^2 = 121" make "x^2" the subject"`

`x^2 = 121/100" find the square root"`

`x = +-sqrt(121/100)`

`x = +11/10 or x = -11/10`

We can also follow the usual method to get:

`100x^2 - 121 = 0" factorise"`

`(10x+11)(10x-11)=0`

`x = -11/1 or x = 11/10`

Answer 2

`x=1.1`
`x=-1.1`

Explanation:

`100x^2=121`
OR
`x^2=121/100`
OR
`x=sqrt(121/100)`
OR
`x= 11/10`
`x=1.1`
OR
`x=-11/10`
`x=-1.1`