4x2-11x-20=(x-4)(4x+5) 4x2-11x-20=4x2+ax+bx-20
ab = 4*-20 = -80
a+b = -11
a = -16, b = 5
4x2-11x-20=4x2-16x+5x-20
4x2-16x+5x-20=4x(x-4)+5(x-4)
4x(x-4)+5(x-4)=(x-4)(4x+5)
Factorised, 4x2-11x-20=(x-4)(4x+5)
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Type your answer here... political factors;legal factors;ecological factors;economical factors;socio-cultural factors and technological factors
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