P(x)=7x^4-3x+4x+7x , x=-5/7
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put the value of x in 7x^4-3x+4×+7x
7x^4+8x
7×(-5/7)^4 + 8×-5/7
625/343 - 40/7
(635-1960)/7
-1325/7
-189.28
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