Factorize
a) 25x2 – 4y2 + 28yz – 49z2
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Answer:
25x2 – 4y2 + 28yz – 49z2
= 25x2 – [4y2 - 28yz + 49z2]
= 25x2 – [(2y)2 - 2 x 2y x 7z + (7z)2]
= (5x)2 – (2y - 7z)2
= (5x + 2y - 7z)(5x – 2y + 7z)
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