Question

(a + b + c)² - 4(a + b + c) - 21
factorise​

Answer 1

$\huge\pink{⛄ Answer}{⛄}$

(a + b + c)2 = (a + b + c)(a + b + c)

(a + b + c)2 = a2 + ab + ac + ab + b2 + bc + ca + bc + c2

(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca

(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca

Answer 2

Answer:

(a + b + c)2 = (a + b + c)(a + b + c)

(a + b + c)2 = a2 + ab + ac + ab + b2 + bc + ca + bc + c2

(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca

(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca

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Step-by-step explanation:

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