Question

Alice

答案是1或-5
求算式
謝謝

11.若x+2(2nn-1)x + Sin-4為完全平方式,則rm =
x° (2m –1)+4 A , = lor's
1 of 5

Answer 1

OWO

因為為完全平方式
所以aX*X+2ab+b*b=(aX+b)(aX+b)
a=1
b=2m-1=>b*b=(2m-1)(2m-1)=4m*m-4m+1
b*b=5m*m-4
4m*m-4m+1=b*b=5m*m-4
m*m+4m-5=0
(m-1)(m+5)=0
m=1or-5