charlietrio123 charlietrio123

03-02-2017
Mathematics

contestada

Solve by transforming into a perfect square trinomial

x squared-14x=15

Respuesta :

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

Otras preguntas

can someone help my lil sis.

which one is it? Can someone pls help it would reallly warm my heart

which is more concentrated 200 ML of an 8-M NaOH solution or 500 mL of a 4-M NaOH solution

The Chinese Peking (Beijing Opera) incorporates _________.

if 100 ml of rat poison is mixed with 2,5l of water then what would be the simplified poison water ratio

Please find the area of this rectangle.

How would you find: the number, 3/7 of which is equal to t ?

34. Discuss the effect that drugs have had on the medical, emotional, social, psychological, and physical dimensions of health and wellness.

What do scientists hope to learn by studying Antarctic?

Find the surface area of the prism. 6.5 feet, 6, 2.5 feet, 11 feet