FACTORIZATION USING IDENTITY
FACTORIZATION - USING IDENTITY
An identity is an equality that remains true regardless of the values chosen for its variables.
ALGEBRAIC IDENTITIES |
EXAMPLE 1
Factorize: 9X2 + 12XY + 4Y2
[ a2 + 2ab + b2 = (a + b)2 ]
9X2 + 12XY + 4Y2 = (3x)2 + 2(3x)(2y) + (2y)2
9X2 + 12XY + 4Y2 = (3x + 2y)2
EXAMPLE 2
Factorize: 25a2 – 10a + 1
[ a2 – 2ab + b2 = ( a – b)2 ]
25a2 – 10a + 1 = (5a)2 – 2(5a)(1) + 12
25a2 – 10a + 1 = (5a – 1)2
EXAMPLE 3
Factorize: 36m2 – 49n2
[ a2 –b2 = (a + b) (a - b) ]
36m2 – 49n2 = (6m)2 – (7n)2
36m2 – 49n2 = (6m + 7n) (6m – 7n)
EXAMPLE 4
Factorize: 4x2 + 9y2 + 25z2 + 12xy + 30yz + 20xz
[(a + b + c)2 = a2 + b2 + c2 + 2ab +2bc +2ca ]
4x2 + 9y2 + 25z2 + 12xy + 30yz + 20xz = (2x+3y+5z)2