Question

(2×-3)^2=25 qual o valor da equacao de 2 grau

Answer 1

(2x-3)²= 25
(2x-3)×(2x-3)= 25
4x²-6x-6x+9=25
4x²-12X+9-25=0
4x²-12x-16= 0

a=4  b=-12  c=-16
Δ=b²-4×a×c
Δ= (-12)²-4×4×(-16)
Δ= 144-16×(-16)
Δ= 144+256
Δ= 400

x'= -b+√Δ/2×a
x'= -(-12)+√400/2×4
x'=12+20/8
x'= 32/8
x'= 4

x"= -b-√Δ/2×a
x"= 12-20/8
x"= -8/8
x"= -1