Question

Factorise:- 3a²–30a+75​

Answer 1

3a² - 30a + 75

= 3(a² - 10a + 25)

= 3(a - 5)²

Hope, this helps...

Answer 2

Answer:

$3 {a}^{2} - 30a + 75$

$3 {a}^{2} - 15a - 15a + 75$

$3a(a - 5) + 15(a - 5)$

$(a - 5)(3a + 15)$

$a = 5$

$a = - 5$

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