Question

RESOLVA AS ESQUÇOES
A) X²-8X15=0
B)X²-6X+10=0
C)X²-9=0
D)2X²-8+8=0

Answer 1

A)x²-8x+15           
Δ=(-8)²-4(1)(15)
Δ=64-60=4
X'=8+2/2⇒10/2=5
X''8-2/2⇒6/2=3

B)x²-6x+10
Δ=(-6)²-4(1)(10)
Δ=36-40=-4
Ñ  existe raiz negativa

C)x²-9=0
x²=9
x=√9
x=3

D)2x²-8x+8
Δ=(-8)²-4(2)(8)
64-64=0
X'=8+0/2⇒8/2=4
X''=8-0/2⇒8/2=4

Ajudei?Bom espero que sim bjos