Question

alguem sabe?
a) 5x+13=2x+4
b) y²-5x-14=0

Answer 1

a) 5x + 13 = 2x + 4

5x - 2x = 4 - 13

3x = -9

x = -9/3

x = -3

b) y^2 - 5x - 14 = 0
Na letra b) nao seria

y^2 - 5y - 14 = 0

Delta = b^2 - 4 × a × c
Delta = ( -5 )^2 - 4 × 1 × ( -14 )
Delta = 25 + 56
Delta = 81

y = (-b +- raiz quadrada de delta ) / ( 2 × a )

y = (-(-5) +- raiz quadrada de 81 ) / ( 2 × 1 )

y = ( 5 +- 9) / 2

y' = ( 5 + 9 ) / 2
y' = 14/2
y' = 7

y" = ( 5 - 9) / 2
y" = (-4)/2
y" = - 2

y' = 7
y" = -2