Solve 2x2 + 12x − 14 = 0 by completing the square.

2(x + 6)2 = 26; x = −6 + square root 13, x = −6 − square root 13

2(x + 6)2 = 20; x = −6 + square root 20, x = −6 − square root 20

2(x + 3)2 = 32; x = 1, x = −7

2(x + 3)2 = 32; x = 13, x = 19

Question

Solve 2x2 + 12x − 14 = 0 by completing the square.

2(x + 6)2 = 26; x = −6 + square root 13, x = −6 − square root 13

2(x + 6)2 = 20; x = −6 + square root 20, x = −6 − square root 20

2(x + 3)2 = 32; x = 1, x = −7

2(x + 3)2 = 32; x = 13, x = 19

thesmartone · Answer

So do you want someone to check your answers?

thesmartone · Answer

$$2x^2+12x-14=0$$
$$x^2+6x-7=0$$
$$x^2+6x=7$$
$$x^2+6x+9=7+9$$
$$(x+3)^2=16$$
$$x+3=\pm4$$
$$x=-3\pm4$$

thesmartone · Answer

You can not just get the answer. That is against teh Code of Conducts and can get someone suspended.

thesmartone · Answer

@Student565

geerky42 · Answer

And yet many of us get away with that.

geerky42 · Answer

Plus I have seen mod giving only answer. Rules are not strict. @TheSmartOne

thesmartone · Answer

@geerky42 but then again only the mods can suspend...

geerky42 · Answer

And because some of them don't ever follow rules, no need to worry about rules, really. Just do your thing...

(unless you repeatedly break rule while it is clearly avoidable)

thesmartone · Answer

thanks lol