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Use the quadratic formula to solve the equation.
x^2 – 7x – 6 = 0
Show work please.
 one year ago
 one year ago
Use the quadratic formula to solve the equation. x^2 – 7x – 6 = 0 Show work please.
 one year ago
 one year ago

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lilg132Best ResponseYou've already chosen the best response.0
\[x = \frac{ b \pm \sqrt{b ^{2} 4ac} }{ 2a}\]
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.0
yes it is an exponent
 one year ago

lilg132Best ResponseYou've already chosen the best response.0
x2 = a 7x = b 6 = c x2 = 1 7x = 7 6 = 6
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
\[x = \frac{ b \pm \sqrt{b ^{2}4ac} }{ 2a }\]where a=1, b=7, and c =6 This is because your equation is in the standard form of ax^2 + bx + c = 0. So, now, just make the substitutions.
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.0
Hmm, ok thanks, let me work this out and I will reply to what I got to check if it is right.
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
Hint: after you make your substitutions, pay special attention to the expression within the radical (the square root sign). You will see that the numbet in the radical is positive, so you will have two real solutions. But your final solution will have a radical in it.
 one year ago

winterfezBest ResponseYou've already chosen the best response.0
dw:1354234621716:dw
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
Are you able to identify the variables a, b, and c and make the substitutions?
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.0
Yes, I got to the step that winterfezz last showed, but I don't know what to do now
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
Start with the expression within the radical. Start with (7)^2. That is the same as 7^2.
 one year ago

winterfezBest ResponseYou've already chosen the best response.0
dw:1354234898685:dw you get 2 answers
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
And when you have a negative number times a positive number, the product will be negative.
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
So, can you determine (7)^2 ?
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
(7)^2 is the same as (7)(7) and that is the same as (7)(7)
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.0
Yes, tcarroll, I know all that basic math stuff xD I am at the part where I have dw:1354235055422:dw
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
That's good!. Because that is your final answer! Well done!
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.0
So I do not simplify it further?
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
That's as far as you can take it.
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
It is customary to leave it with the + sign
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.0
Ok, so no decimal needed, I just leave it as this?
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
That's good just like that.
 one year ago

kirk.freedmanBest ResponseYou've already chosen the best response.0
Thank both of you very much!:)
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
\[\frac{ 7\pm \sqrt{73} }{ 2 }\]Like that
 one year ago

tcarroll010Best ResponseYou've already chosen the best response.1
You're very welcome!
 one year ago
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