Question

RESOLVA (X-4) (X-4) = 2X - 9

Answer 1

(x-4)·(x-4)= 2x-9
x² - 4x - 4x + 16= 2x - 9
x² - 8x - 2x +16 + 9= 0
x² -10x +25= 0
a=1 b=-10 c=25

Δ= b²-4·a·c
Δ= (-10)²-4·1·25
Δ= 100-100
Δ=0

x'= -b+√Δ/2·a
x'= -(-10)+√0/2·1
x'= 10+0/2
x'= 5

x"= -b-√Δ/2·a
x"= -(-10)-√0/2·1
x"= 10-0/2
x"= 5