21. Factorisation of:- 9 a 2 - 12 a + 4 is: -
O (2a + 1)2
O (2a-1)2
O (3a - 2)2
O (2a - 2)2
Answers
Answered by
1
Step-by-step explanation:
correct option is (3a-2)2
Answered by
1
Answer:
(3a-2)²
Step-by-step explanation:
9a²-12a+4
=9a²-6a-6a+4
=3a(3a-2)-2(3a-2)
=(3a-2)(3a-2)
=(3a-2)²
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