3x² + 2x - 4 = 0
Δ = b² - 4.a.c
Δ = 2² - 4 . 3 . -4
Δ = 4 - 4. 3 . -4
Δ = 52
x = (-b +- √Δ)/2a
x' = (-2 + √52)/2.3
x'' = (-2 - √52)/2.3
x' = 0,8685170918213297
x'' = -1,5351837584879966
2 Decimal places
x' = 0,87
x'' = -1,54
Melissa, Juan, Sara, and Marsha.
Hope this helps! :)
1. 
a= 1 , b= -2 , c= -1
x=1
now use the x value to find y
y = -2
vertex (1,-2)
Answer:
14
Step-by-step explanation:
x / y = 5 / 3, then 3x = 5y , x = 5/3y
we can type 5/3y instead of x ;
5/3y + y = 8/3y = 56, then y = 21
.
now let's find x ;
x - 21 = 56, then x = 35
x - y = 35 - 21 = 14
