Bantuan matematik?

Bantuan matematik?
Anonim

Jawapan:

#x = -5 + -sqrt (25-c) #

Penjelasan:

Melengkapkan alun-alun, kita ada

# x ^ 2 + 10x + c = 0 #

# => x ^ 2 + 10x = -c #

# => x ^ 2 + 10x + 25 = 25-c #

# => (x + 5) ^ 2 = 25-c #

# => x + 5 = + -sqrt (25-c) #

#:. x = -5 + -sqrt (25-c) #