(2x-3) (x-8) equação do 2 grau, conta e responsta pfv ?.... Pergunta de ideia deKellyAzevedo

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KellyAzevedo @KellyAzevedo

December 2019 2 7 Report

(2x-3) (x-8) equação do 2 grau, conta e responsta pfv ?

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Vi1984

Verified answer

(2x - 3) . (x-8) = 2x² - 16x - 3x + 24 = 0

2x² - 19x + 24 = 0

Δ=b²-4ac = (-19)² - 4.2.24 = 361 - 192 = 169
√Δ = 13

x = (-b +- √Δ)/2a

x1 = (+19 + 13)/2.2 = 32/4 = 8

x2 = (+19 - 13)/2.2 = 6/4 = 3/2

1 votes Thanks 1

PauloLuis (2x - 3).(x - 8)
Aplicando distributiva temos:2x² - 16x - 3x + 242x² - 19x + 24

Δ = b² - 4.a.c
Δ = -19² - 4 . 2 . 24
Δ = 361 - 4. 2 . 24
Δ = 169

Há 2 raízes reais.

x = (-b +- √Δ)/2a

x' = (--19 + √169)/2.2
x'' = (--19 - √169)/2.2

x' = 32 / 4
x'' = 6 / 4

x' = 8
x'' = 1,5

0 votes Thanks 0