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dividend = divisor × quotient + remainder
dividend = divisor × ( x+1) + 19
put x = -1
=> (-1)^4 -2(-1)^3+3(-1)^2 +a +3a-7 = 0 + 19
=> 1+2+3+4a-7 = 19
=> 1+2+3+4a-7 = 19
=> 4a -1 = 19=> a = 20/4
=> a = 5
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by putting the value of x in the eqn we can find the value of a
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