Question

Solve using the quadratic formula

Answer 1

x² + 7x/10 = 1/7

x² + 7x/10 - 1/7 = 0

Δ = b² - 4.a.c

Δ = (7/10)² - 4 . 1 . (-1/7)

Δ = 0,48999999999999994 - 4. 1 . (-1/7)

Δ = 1,0614285714285714

Há 2 raízes reais.

x = (-b +- √Δ)/2a

x' = (-(7/10) + √1,0614285714285714)/2.1

x'' = (-(7/10) - √1,0614285714285714)/2.1

x' = 0,3302565561201596 / 2

x'' = -1,7302565561201595 / 2

x' = 0,1651282780600798

x'' = -0,8651282780600797

Rounding

x' = 0,17

x'' = -0,87