obtain all the zeros of x³+3x²-5x-15
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Step-by-step explanation:
x³+3x²-5x-15
= x2 ( x+3) -5 ( x + 3 )
= (x2-5) ( x+3)
there fore,
x2-5 = 0. or. x+3=0
=> x2 = 5. =>x= -3
=> x=√5
the zeros are √5 and -3
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