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anonymous
 one year ago
Will give a medal. Need help urgently.
Which of the following is a solution of x^2 + 5x = 2?
anonymous
 one year ago
Will give a medal. Need help urgently. Which of the following is a solution of x^2 + 5x = 2?

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P0sitr0n
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{5\pm\sqrt{17}}{2}\] by solving it using the quadratic formula

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Can you explain it completely so that I know how to do it in the future?

P0sitr0n
 one year ago
Best ResponseYou've already chosen the best response.1Recall that is \[\frac{b\pm\sqrt{b^24ac}}{2a}\], where a is the coefficient of x^2 (1 in our case), b is of x (5 in our case) and c is the constant term (2 in our case, dont forget the total experssion must be = 0)

P0sitr0n
 one year ago
Best ResponseYou've already chosen the best response.1This will give you two roots, (note the plus / minus)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok.. then you just solve right @P0sitr0n ?

P0sitr0n
 one year ago
Best ResponseYou've already chosen the best response.1this formula was derived specifically for this purpose

P0sitr0n
 one year ago
Best ResponseYou've already chosen the best response.1that said, don't forget to always check that the term under the square root (called the dicriminant) is always positive or zero

P0sitr0n
 one year ago
Best ResponseYou've already chosen the best response.1basically you only plug in a, b and c into the formula (those coefficients are taken from your equation)
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