b8luv4jnlswiftahiA b8luv4jnlswiftahiA

06-07-2016
Mathematics

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(x-2)(x 10)=13 a. x=3 b. x=8 c. x=10 d. x=11

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HomertheGenius HomertheGenius

13-07-2016

( x - 2 ) ( x + 10 ) = 13
x ² + 10 x - 2 x - 20 = 13
x ² + 8 x - 33 = 0 (the quadratic equation ):[tex] x_{12} = \frac{-8\pm \sqrt{64 + 132} }{2}= \frac{-8\pm14}{2} [/tex]
x 1 = 3, x 2 = -11
Answer: a ) x = 3 ( one solution )

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