Question

factorise a²+b²+c²-5c²+2ab​

Answer 1

Step-by-step explanation:

a²+b²+2ab+c²-5c²

(a+b)²-4c²

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Answer 2

Step-by-step explanation:

a² + b² + c² - 5c² + 2ab

a² + b² + 2ab + c² - 5c²

(using a² + b² = a² + b² + 2ab )

( a + b )² - 4c²

(a + b)² - (2c)²

(using a² - b² = (a+b) (a-b) )

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