Use the quadratic formula to solve 4x^2 + x - 1 = 0.
a. {.0.5, 0.7}
b. {-0.3, -0.1}
c. {0.2, 0.4}
d. {-0.6, 0.4}

X= -b  ±  √b^2 - 4ac/2a

x = -1  ± √1^2 - 4()/2(4)

x = -1 ±  √1+16/8

x = -1 ±  √17/8

x = -1 ± 4.1/8

x = -1+4.1/8 = 3.1/8 = 0.4

x = -1-4.1/8 = -5.1/8 = -0.6

x =  {-0.6, 0.4}

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