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Mathematics 24 Online
OpenStudy (anonymous):

What is the length of AC?

OpenStudy (anonymous):

OpenStudy (raden):

let AB is x AB * AC = ED * CE x (x+6) = 7 * 12 solve for x, first

OpenStudy (raden):

seems you need the quadratic formula to get x x = (-b +- sqrt(b^2 - 4ac))/(2a)

OpenStudy (anonymous):

how do you know what is a b and c? @RadEn

OpenStudy (raden):

x (x+6) = 7 * 12 x^2 + 6x = 84 x^2 + 6x - 84 = 0 from information above the values of a = 1, b = 6 and c = -84

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