1.

25a²-4b²-28bc-49c². Factorise the equation step by step. ​

Answer»

Answer:

25 a² -( (2b)²+ (7C)² -2* 7*2*B*c)

(5A)²- (2b - 7c)²

(5a + 2b-7c)( 5a - 2b+7 c)



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