बहुपद x2 2x 8 के शून्यक की संख्या है
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उत्तर: x2 –2x–8=0
Or, x2–4x+2x–8=0
Or, x(x–4)+2(x–4)=0
Or, (x+2)(x–4)=0
इसलिये शून्यक = -2 और 4
हम जानते हैं कि शून्यक का योग = −b / a या, −2 + 4 = − ( − 2 )
या, LHS = RHS
हम जानते हैं कि शून्यक का गुणनफल = c / a या, −2 x 4 = − 8
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