Question

Complementando Quadrados:

Resolva: x² + 12x = 28

Answer 1

a:1; b:12; c:-28
Δ= b ² - 4.a.c
Δ=12 ²-4.1.-28
Δ=144+112
Δ=256
Δ= √256
Δ=16

x = – b ± √∆
2a

X’= -12+16
2.1
X’= 2

X’’= -12-16
2.1
X’’= -14