Question 154124
4^3x^2 +5x -2^3

= 64x^2 + 5x - 8

Use the quadratic formula:

x = [-5 +- sqrt(25 - 4*64*-8)]/(128)

x = [-5 +- 40.5302..]/128

x = 0.277580... or x = -0.355705...
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So the factors are (x-0.277580..)(x+0.355705...)

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Cheers,
Stan H.