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

Fish meal is better than artificial fertilizers. How could this statement be revised to make it a hypothesis?
First two lessons : £12.75 each lesson All other lessons : £20.00 Each lesson Leah has some lessons with Stan's driving school. The total cost of lessons is £30
Whats the defenition of heat ?
Unscramble Pxnaed involving algebra
What goes into the cell for cr to occur
What goes into the cell for cr to occur
if Teresa's daughter is my daughter's mother Who am I to Teresa
Which is an example of the bottleneck effect? Green beetles move to a new location and build a new colony there. Green beetles survive as birds don't see them
in 14.987 what place value is the 7 in
I need to write the number 36 in expanded form