Question

pfv me ajudem preciso dos calculos !!!

Answer 1

A) x² + 14x + 49 = 9
x² + 14x + 49 -9 =0
x² + 14x + 40 = 0
Δ= b² - 4 • a • c
Δ= (14)² - 4 • 1 • 40
Δ = 196 - 160 = 36
x = – b ± √Δ ÷ 2a
x = -14 ± √36 ÷ 2 • 1
x = -14 ± 6 ÷ 2
RAIZES:
* x'= -14 + 6 ÷2
x'= -8÷ 2 = -4.
* x"= -14 - 6 ÷2
x"= -20 ÷ 2 = -10.

B) 4x² + 32x +64 = 4
4x² + 32x + 64- 4= 0
4x² + 32x + 60 = 0 (÷4)
x² + 8x + 15 = 0
Δ= b² - 4 • a • c
Δ= 8² - 4 • 1 • 15
Δ= 64- 60 = 4
x = – b ± √Δ ÷ 2a
x = -8 ± √4 ÷ 2 • 1
x = - 8 ± 2 ÷ 2
RAIZES:
* x'= -8 +2÷ 2
x'= -6 ÷ 2 = -3.
* x"= -8 - 2 ÷ 2
x"= -10 ÷ 2 = -5.