As Equações de 1 Grau
Por: Milena Ribeiro • 11/8/2021 • Trabalho acadêmico • 449 Palavras (2 Páginas) • 124 Visualizações
1°) x² – 4x – 5 = 0
x² + x + 5x – 5 = 0
x . (x + 1) – 5 (x + 1) = 0
(x + 1) . (x-5) = 0
X + 1 = 0
X – 5 = 0
X = -1, X= 5[pic 1][pic 2]
[pic 3]
2°) 4x² + 8x + 6 = 0
2x² + 4x + 3 = 0
[pic 4]
[pic 5]
[pic 6]
3°) x² + 2x - 8 = 0
X² + 4x – 2x – 8 = 0
X . (x + 4) -2 (x + 4) = 0
(x + 4) . (x – 2)= 0
X + 4 = 0
X – 2 = 0
X = -4, x = 2
[pic 7]
4°) x² - 5x + 8 = 0
[pic 8]
[pic 9]
5°) x²-14x+48=0
X² - 6x – 8x + 48 = 0
X . (x – 6) – 8 (x – 6) = 0
(x – 6) . (x – 8) = 0
X – 6 = 0
X – 8 = 0
X = 6 , x = 8
[pic 10]
6°) x²+3x-28=0
X² + 7x – 4x – 28= 0
X . (x + 7) – 4 (x + 7) = 0
(x + 7) . (x – 4) = 0
X + 7= 0
X – 4 = 0
X = -7, x = 4
[pic 11]
7°) x² + 9 = 4x
X² + 9 – 4x = 0
X² - 4x + 9 = 0
[pic 12]
[pic 13]
8°) 7x² + x + 2 = 0
[pic 14]
[pic 15]
9°) x² - 18x + 45 = 0
X² - 3x – 15x + 45 = 0
X . (x – 3/0 – 15 ( x – 3) = 0
(x – 3) . (x – 15) = 0
X – 3 = 0
X – 15 = 0
X = 3, X = 15
[pic 16]
10°) -x² - x + 30 = 0
X² + x – 30 = 0
X² + 6x – 5x – 30 = 0
X . (x + 6) – 5 (x + 6) = 0
(x + 6) . (x – 5) = 0
X + 6 = 0
X – 5 + 0
X = -6, x = 5
[pic 17]
11°) (x - 3)² = -2x²
X² - 6x + 9 = -2²
X² - 6x + 9 + 2x² = 0
3x² - 6x + 9 = 0
X² - 2x + 3 = 0
[pic 18]
[pic 19]
12°) x² - 25 = 0
X² = 25
X = [pic 20]
X = -5
X = 5
X = -5, x = 5
[pic 21]
13°) 2x² - 18 = 0
X² - 9 = 0
X² = 9
X = [pic 22]
X = - 3
X= 3
X = - 3, x = 3
[pic 23]
14°) 7x² - 14 = 0
X² - 2 = 0
X² = 2
[pic 24]
[pic 25]
[pic 26]
15°) x² + 25 = 0
X² = -25
[pic 27]
[pic 28]
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