Factorise 4 x square - 2 x minus 20 equals to x square + 9 x
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Given : 4x² - 2x - 20 = x² + 9x
To Find : Factorise
Solution:
4x² - 2x - 20 = x² + 9x
=> 3x² - 11x - 20 = 0
=> 3x² - 15x + 4x - 20 = 0
=> 3x( x - 5) + 4(x - 5) = 0
=> ( 3x + 4) (x - 5) = 0
4x² - 2x - 20 = x² + 9x
=> ( 3x + 4) (x - 5) = 0
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