*4. What are all values of x for which the graph of y=6x^2+ x/2 +3+6/x is concave down?
a) x<-1
b) x<0
c) -1 d) 0 e)x>-1

step-by-step explanation:

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629

(1,-1) i hope this

step-by-step explanation: