Identify the mistake

Algebra Level 4

Tell me at which step I'm going wrong.

  1. (a+7)=9(a+7)=9
  2. (a+7)2=81(a+7)^{2}=81
  3. a2+14a+49=81a^2 +14a+49=81
  4. a2+14a32=0a^2 +14a-32=0
  5. a2+16a2a32=0a^2+16a-2a-32=0
  6. a(a+16)2(a+16)=0a(a+16)-2(a+16)=0
  7. So, a=16a=-16 and a=2a=2
  8. Putting the value of a in our first equation.
  9. 16+7=9-16+7=9

How is that possible?

×

Problem Loading...

Note Loading...

Set Loading...