Question

1* 2x² - 7X+3=0


2* 8x-5y=-2
-8x-6y=-9​

Answer 1

Explicação passo-a-passo:

1)

2x² - 7x + 3 = 0

a = 2

b = -7

c = 3

∆ = (-7)² - 4.2.3

∆ = 49 - 24

∆ = 25

x = -(-7) ± √25/2.2

x = 7 ± 5/4

x' = 7 + 5/4

x' = 12/4

x' = 3

x" = 7 - 5/4

x" = 2/4

x" = 1/2

S = {3, 1/2}

2)

8x - 5y = -2

-8x - 6y = -9

-5y = -2

-6y = -9

-11y = -11

y = -11/-11

y = 1

8x - 5.1 = -2

8x - 5 = -2

8x = -2 + 5

8x = 3

x = 3/8

-8x - 6.1 = -9

-8x - 6 = -9

-8x = -9 + 6

-8x = 3

x = 3/8

8.3/8 - 5.1 = -2

24/8 - 5.1 = -2

3 - 5.1 = -2

3 - 5 = -2

-2 = -2

S = {3/8, 1}

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