find a and b such that x+2 and x-2 are factors of ax⁴+2x³-3x²+bx-4.
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so the polynomial must satisfy the equation
by substituting values of x= 2 ,-2 we should get zero
16+2b=0
16a-2b-32=0
by solving above two equations
we get a=1,b=-8
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