We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
73
1
avatar

Jack wrote the following: (x+1)^2 - (x+2)(x-3) = x^2 + 2x+1-x^2-x-6 = x-5.

What mistakes did he make? write a correct simplification and explain how to avoid making this error. 

 Jun 10, 2019
 #1
avatar+721 
+2

Let's see.

(x+1)(x+1)-(x+2)(x-3)

(x^2+2x+1)-(x^2-x-6)

x^2+2x+1-x^2+x+6

3x+7

 

We can see how he didn't distribute the negative sign in -(x^2-x-6) to the -x and -6.

 

You are very welcome!

:P

 Jun 10, 2019

16 Online Users