Factorise: 4a 2 -9b 2 - 2a-3b
Answers
Answered by
7
4a²-2a-9b²-3b
=2a(a-1)-3b(3b-1)
=(2a-3b)(a-1)(3b-1)
3b-1=0
b=1/3
a-1=0
a=1
=2a(a-1)-3b(3b-1)
=(2a-3b)(a-1)(3b-1)
3b-1=0
b=1/3
a-1=0
a=1
Answered by
24
Answer:
Question :-
➠ 4a² - 9b² - 2a - 3b
Formula used :-
➪ a² - b²
➙ (a + b) (a - b)
Answer :-
➠ 4a² - 9b² - 2a - 3b
➻ (2a)² - (3b)² - (2a + 3b)
➻ (2a + 3b) (2a - 3b) - (2a + 3b)
➻ (2a + 3b) {(2a - 3b) - 1} [ Taking (2a +3b) common]
➻ (2a + 3b) (2a - 3b - 1)
∴ The value of 4a² - 9b² - 2a - 3b is (2a + 3b) (2a - 3b - 1)
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