Question

a2+b2+ c² - 5c² + 2ab​

Answer 1

Answer:

${a}^{2} + {b}^{2} + {c}^{2} - 5 {c}^{2} + 2ab = {a}^{2} + {b}^{2} + 2ab - 4 {c}^{2} \\ \\ = {(a + b)}^{2} - 4 {c}^{2} \\ \\ = {(a + b)}^{2} - {(2c)}^{2} \\ \\ = (a + b + 2c)(a + b - 2c)$

Answer 2

Answer:

(a+b+2c)(a+b-2c)

Step-by-step explanation:

formulee used---->

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1. (a+b)^2=a^2+b^2+2ab

2. p^2 - q^2=(p+q) (p-q)