Question

factorise
25a sq. -4b sq. +28bc-49c sq.

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

25a sq - 4b sq +28bc -49c sq

Take - out

25a sq -(4b sq -28bc +49c sq)

Factorise using property (a-b)sq=a sq -2ab +b sq

25a sq -(2b -7c)sq

Now factorie using a sq - b sq=(a+b)(a-b)

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

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