ପ୍ରକୃତ ସହଗ ସହିତ ଦ୍ଵିଘାତୀ ସମୀକରଣ କଣ ଯାହାର ପ୍ରକୃତ ମୂଳ 4 ଏବଂ −5 ଅଛି:

1
x2 − x − 30 = 0
2
x2 − 5x − 24 = 0
3
x2 − 4x − 20 = 0
4
x2 + x − 20 = 0

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