Answer:
Explanation:
it cuts x-axis where y=0 or f(x)=0
x²-3x-28=0
x²-7x+4x-28=0
x(x-7)+4(x-7)=0
(x-7)(x+4)=0
x=7,-4it will cut x-axis at (-4,0) and (7,0)
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