Try These Maths if you're maths expert.
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Step-by-step explanation:
let, f(x)= 3x^3 +2x^2 -4x + k
now, x+1 is factor of f(x)
so, f(-1)=0
or, 3(-1)^3 +2(-1)^2-4(-1)+k = 0
or, -3+2+4+k = 0
or, k = -3
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