please solve this:
x^2-2x+15=0
困難factorization
2009-09-22 7:26 am
回答 (3)
2009-09-22 9:35 pm
✔ 最佳答案
x^2 - 2x + 15 = 0Unfactorizable
Quadratic Formula:
x = (2 +/- #( 4 - 4(1)(15) ) ) / (2) #()=square root
x = (2 +/- #(4 - 60) ) / 2
x = (2 +/- #(-56) ) / 2
x = (2 +/- #(56)i ) / 2
x = 1 +/- (#(56)i / 2)
You should be able to check solution to verify whether or not the solution is right.
2009-09-22 3:21 pm
please solve this：x^2－2x+15=0
Sol
x^2－2x+15=0
D=(－2)^2-4*1*15=-56
x=(2+/-sqrt(-56))/2=1+/-isqrt(14)
So
x^2－2x+15=(x－1+isqrt(14))(x－1-isqrt(14))
Sol
x^2－2x+15=0
D=(－2)^2-4*1*15=-56
x=(2+/-sqrt(-56))/2=1+/-isqrt(14)
So
x^2－2x+15=(x－1+isqrt(14))(x－1-isqrt(14))
收錄日期: 2021-04-23 20:06:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090921000051KK02083