Question

(x-20)²=x²-20 pleas im struggling i need help

Answer 1

Explanation:

`(x-20)^2=x^2-20`

Expanding LHS gives:

`x^2-40x+400=x^2-20`

`-40x+400=-20` (subtracted
`x^2` from both sides)

`-40x=-420` (subtracted 400 from both sides)

`x=(-420)/(-40)` (divided both sides by-40)

`x=(21)/(2) =10(1)/(2)`