Solve the following equation by transforming it into a perfect square trinomial.

x² – 14x = 15

{–22, 36}

{57, 71}

{–1, 15}

{–15, 29}

Question

02-02-2017
Mathematics

contestada

Solve the following equation by transforming it into a perfect square trinomial.

x² – 14x = 15

{–22, 36}

{57, 71}

{–1, 15}

{–15, 29}

Respuesta :

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TheHero TheHero · Answer 1 · 2017-02-03T18:33:28+01:00

TheHero TheHero

03-02-2017

x^2 - 14 x = 15

(x - 7)^2 - 49 = 15

(x-7)^2 = 64

x - 7 = - or + 8

x = 15 or -1

Just take half o the coefficient of x and subtract it squared as above.

In general

x^2 + ax = b

(x + a/2)^2 - a^2/4 = b

Answer Link

Solve the following equation by transforming it into a perfect square trinomial. x² – 14x = 15 {–22, 36} {57, 71} {–1, 15} {–15, 29}

Respuesta :

Otras preguntas

Solve the following equation by transforming it into a perfect square trinomial.

x² – 14x = 15

{–22, 36}

{57, 71}

{–1, 15}

{–15, 29}