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

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

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.

question: how many people can she serve?

answer: she can serve 16.66666667 people. so she can only give 16 people a complete serving.

question: does she have enough ice cream for her guests?

answer: no. explanation: she only has enough for 16 people to have a full serving. however, she can give a 17th person a partial serving.