Answer:
k= 28.875
Explanation:
4x+3= 0
4x= -3
X = -3/4
f(X)= 20x³+23x²-10x+k
0= 20(-3/4)³ + 23 (-3/4)² -10(-3/4)+k
20(-27/64)+23(9/16) +30/4+k
-540/64+207/16+7.5+k
-8.4375+12.9375+7.5+k. 0=-28.875+k
k=28.875
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