ss948054 ss948054

08-08-2017
Mathematics

contestada

Solve by completing the square: x^2+15=8x

Respuesta :

sheheryar91 sheheryar91

20-08-2017

x^2+15=8x
x^2-8x=-15
x^2 - 2 (x)(4) =-15
adding 16 on both sides
x^2 - 2 (x)(4) +16=-15+16
x^2 - 2 (x)(4) + 4^2= 1

(x-4)^2=1

taking square root on bothsides x-4 = +-1
so x-4=1 or x-4=-1
x-5 or x=3

Answer Link

Otras preguntas

what would happen to a plant cell placed in a solution of seawater ?

Which sentence uses italics or quotation marks correctly? A. Some day I hope to read all of Leo Tolstoy's long novel titled War and Peace. B. Who painted "Th

how to find the circumference of a cirlcle

Factor completely: 3x^2 – 21x + 30 A. 3(x – 2)(x – 5) B. (3x – 2)(x – 15) C. 2(x – 3)(x – 10) D. (x – 2)(x – 5)

what is a passage followed by magma in a volcano

A chair that cost $210 was reduced by 40% for a one day sale after the sale, the sale price was increased by 40% what is the price of the chairEnter

hurricanes form from hot wet air masses. where might this type of air mass be found?explain

The question asks to simplify the following (imagine as fraction form / sign stands for fraction form) a+6/c/2a+6/2c

4 tomatoes cost 3.4 what is the unit rate

what king conquered Greece in the 300s bc