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Diana.xL
 one year ago
If there are two real solutions to the equation x^2 + 4x + c=0 , which is a possible value of c?
20
17
5
16
Diana.xL
 one year ago
If there are two real solutions to the equation x^2 + 4x + c=0 , which is a possible value of c? 20 17 5 16

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imqwerty
 one year ago
Best ResponseYou've already chosen the best response.0for 2 real solutions the discriminant should be a perfect square :)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.0can u tell what is the value of discriminant when u put c=16

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0well to have 2 real solution, then the discriminant is \[b^2  4ac \ge 0\] and the result is either 0 or a square number... so you have a = 1, b = 4 and c then \[4^2 4 \times 1 \times c \ge 0\] then \[16  4c \ge 0 \] so solve the inequality then find the solution that meets the condition of the inequality. don't forget, dividing by a negative requires the inequality to be reversed. and just a quick revision on the discriminant \[b^2  4ac = 0\] there are 2 equal roots \[b^2  4ac >0 ~~and~~b^2  4ac ~~is~a~\square ~number\] then the roots, are real, unequal and rational. Hope it makes sense
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