Question

$100b {}^{2} - 60bc + 9c {}^{2}$
factorise the following using identities ​

Answer 1

Answer:

(10+3)²

(10+3)(10+3)

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Answer 2

Step-by-step explanation:

$100b^{2} - 60bc + 9 {c}^{2} = \\ 100 {b}^{2} - 30bc - 30bc + 9 {c}^{2} =$

$10b(10b - 3c) - 3c(10b - 3c) \\ = (10b - 3c)(10b - 3c)$