Answered

Which of the following is a quadratic equation?
a. 2r² + 4r -1
b. 3t-7=12
c. s² + 5s - 14 = 0
d. 2x² - 7x ≥ 3

Sagot :

Adamsyakirviz
C.s^2+5s-14=0 

 s^2+5s-14=0 
(s+7)(s-2)=0 
s=-7 v s=2

there must be =0 :)