Resposta:
(2x −5)(x −4) −7 = (x −2)(x −3)
2x . x + 2x . -4 -5 . x -5 . -4 -7 = x . x + x . -3 -2 . x -2 . -3
\ / \ / \ / \ / | \ / \ / \ / \ /
2x² -8x -5x +20 -7 = x² - 3x -2x +6
2x² -x² -8x -5x +3x +2x +20 -7 -6 = 0
\ / \ / \ / \ /
x² -13x +5x +7 = 0
\ /
x² -8x +7 = 0
x² -8x +7 = 0 a = 1 b = -8 c = 7
Δ = b² - 4.a.c
Δ = (-8)² - 4.1.7
Δ = 64 - 28
Δ = 36
x = -b +- √Δ / 2a
x = -(-8) +- √36 / 2.1
x = +8 +- 6 / 2
x' = +8 -6 / 2 x'' = +8 +6 / 2
x' = 2 / 2 x'' = 14 / 2
x' = 1 x'' = 7
S = { 1, 7 }
Explicação passo a passo:
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Resposta:
(2x −5)(x −4) −7 = (x −2)(x −3)
2x . x + 2x . -4 -5 . x -5 . -4 -7 = x . x + x . -3 -2 . x -2 . -3
\ / \ / \ / \ / | \ / \ / \ / \ /
2x² -8x -5x +20 -7 = x² - 3x -2x +6
2x² -x² -8x -5x +3x +2x +20 -7 -6 = 0
\ / \ / \ / \ /
x² -13x +5x +7 = 0
\ /
x² -8x +7 = 0
x² -8x +7 = 0 a = 1 b = -8 c = 7
Δ = b² - 4.a.c
Δ = (-8)² - 4.1.7
Δ = 64 - 28
Δ = 36
x = -b +- √Δ / 2a
x = -(-8) +- √36 / 2.1
x = +8 +- 6 / 2
x' = +8 -6 / 2 x'' = +8 +6 / 2
x' = 2 / 2 x'' = 14 / 2
x' = 1 x'' = 7
S = { 1, 7 }
Explicação passo a passo: