Factorise the following:
a)6x²+5x-6
b)3x²-x-4
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Question - 1). 6x² + 5x - 6 = 0
Solution: We will Factorise it by splitting middle term.
=> 6x² + 5x - 6 = 0
=> 6x² + 9x - 4x - 6 = 0
=> 3x(2x + 3) - 2(2x + 3) = 0
=> (3x - 2) (2x + 3) = 0
=> 3x = 2
=> x = 2/3
And,
=> 2x + 3 = 0
=> 2x = -3
=> x = -3/2
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Question - 2). 3x² - x - 4 = 0
Solution: We will Factorise it by splitting middle term.
=> 3x² - x - 4 = 0
=> 3x² - 4x + 3x - 4 = 0
=> x(3x - 4) + 1(3x - 4) = 0
=> (x + 1) (3x - 4) = 0
=> x + 1 = 0
=> x = - 1
And,
=> 3x - 4 = 0
=> 3x = 4
=> x = 4/3
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