\( y = x^2 + bx + 256 \) cuts the x axis at (h, 0) and (k, 0). If h and k are integers, what is the least value of b?
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radio_button_unchecked(A) -32
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radio_button_unchecked(B) -256
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radio_button_unchecked(C) -255
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radio_button_unchecked(D) -257
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radio_button_unchecked(E) 0