gavinparker85 gavinparker85
  • 05-05-2020
  • Mathematics
contestada

What are the solutions of the equation (x + 2)2 – 2(x + 2) – 15 = 0? Use u substitution to solve.

Respuesta :

ghanami
ghanami ghanami
  • 05-05-2020

Answer:

Step-by-step explanation:

hello :

(x + 2)2 – 2(x + 2) – 15 = 0

let : t= x+2

t²-2t-15 =0

(t-5)(t+3)=0

t-5=0  or t+3=0

t=5 or t=-3

but  : t =x+2  

if : t=5    x+2 =5   so : x=3

if : t= -3     x+2 = -3   so : x= -5

conclusion two solutions : 3  , -5

Answer Link

Otras preguntas

Please help me solve e
How can the US invade Cuba without it looking like the US was invading Cuba?
What does X equal? Please help me!! Click on the picture
Help me solve this problem asap
A person suspects a standard number cube is not so standard. Another person rolls this cube 100 times, and it lands on a six 42 times. A third person rolls the
What are some main points about star formation
In sleep, what does REM stand for? a Radical eye movement b Random eye maneuver c Rapid eye movement d Rigid eye motion
What is the approximate value of loge 25?
How many atoms are in 88 grams of FeCI3?​
Anybody can help me solve this