How do you factor this

[From: ] [author: ] [Date: 11-05-26] [Hit: ]

25m + 35n
ysquared + 4y- 21
3dsquared - 75

a)25m + 35n =
5(5m+7n)
b)ysquared + 4y- 21=
(y+7)(y-3)
c)3dsquared - 75=
3(dsquared - 25) =
3(d+5)(d-5)

Factorisation
Quadratic formula
Different of two squares and/or completing the square

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