Question

Factorise the following
4r? - 25
4r + 4y + 36
​

Answer 1

$4 { r}^{2} - 25 \\ {(2r)}^{2} - {5}^{2} \\ (2r + 5)(2r - 5)$

$4r + 4y + 36 \\ 4(r + y + 9)$