Question

Factorise the following

25r²-100=0

Answer 1

`25[r - 2][r + 2]`

Explanation:

`25{r}^(2) -100 \\ 25({r}^(2) - 4) \\ 25(r - 2)(r + 2)`

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Answer 2

Plz don't delete...cuz im tryna help '-'

Explanation:

25r²-100=0

25r^2 = 100

cuz the (-) will turn (+) when taken to the other side of the (=) sign

25r^2 = 100

divide both sides by 25

divide both sides by 25 then we get

r^2 = 4

r^2 = 2^2

now take the sqare root of both sides

r = 2