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Byju's Answer
Standard IX
Mathematics
Identity (x+y)(x-y)
X∧ 2-4 xx∧ 2-...
Question
(X^2-4x)(x^2-4x-1)-20
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Solution
(x² - 4x )(x² -4x -1) -20
let (x² -4x ) = P
P(P -1) -20
P² -P -20
P² -5P +4P -20
P( P -5) +4 ( P -5)
(P +4 )( P -5)
put P = x² - 4x
(x² -4x +4)( x² - 4x -5)
(x -2)²( x + 1)(x -5)
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