Question

2) 4x ao quadrado + 9 = 12 x calcule ?

Answer 1

4x²+9=12x
4x²-12x+9=0

a=4 b=-12 c=9

Δ=b²-4.a.c
Δ=(-12)²-4.4.9
Δ=144-144
Δ=0

x=-b√Δ/2.a
x=-(-12)√0/2.4

x₁=12+0/8
x₁=12/8
x₁=3/2

x₂=12-0/8
x₂=12/8
x₂=3/2

Espero ter ajudado!

Answer 2

4x² + 9 = 12x
4x² - 12x + 9 = 0
a: 4
b: -12
c: 9
Δ = (b)² - 4.a.c
Δ = (-12)² - 4.4.9
Δ = 144 - 144
Δ = 0

x = – b ± √∆
      2∙a
x = 12 ± 0
       2.4
x1 = $\frac{12}{8}$ = 1,5

x2 = $\frac{12}{8}$ = 1,5