Question

Ajudemmm pfvrrr galera

Answer 1

r = a 2 - a1
r =  a 3 - a 2
a 2 - a 1 = a 3 - a 2
a 1 = 2 x - 3
a 2 = x²
a 3 =  5 x
x² - (2 x - 3) = 5 x - x²
x² - 2 x + 3 = 5 x - x²
x² + x²  - 2 x - 5 x + 3 = 0
2 x² -7 x + 3 = 0
Δ = b² - 4 .a.c
Δ = (-7)² - 4 . 2 . 3
Δ = 49 - 24
Δ = 25 ⇒√25 = 5
x = -b + ou - 5/2.2
x´= -(-7) + 5 /4
x´= 7 + 5/4
x´= 12/4
x´= 3
x´´ = 7 - 5 / 4
x ´´ = 2/4
x´´ = 1/2
S = {1/2 ;3}
P.A(3,9,15)

P.A(2,X ,18
R = A 2 - A 1
R = X - 2
R = A 3 - A 2
R = 18 - X
X - 2 = 18 - X
X + X - 2 = 18
2 X = 18 + 2
2 X = 20
X = 20/2
X = 10
a) x = 10 P.A(2,10,18)
b)r = a 2 - a 1
r = 10 - 2
r = 8