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Abdullag expands (x+3)² and gets the answer x²+9. a) Describe what he has done wrong b) Expand (x+3)² and simplify

Abdullag expands (x+3)² and gets the answer x²+9. a) Describe what he has done wrong b) Expand (x+3)² and simplify
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4 votes
Abdullag expands (x+3)² and gets the answer x²+9.

a) Describe what he has done wrong
b) Expand (x+3)² and simplify

User Dimitar Dimitrov
by
8.2k points

1 Answer

4 votes

a)

  • Abdullah didn't expand (x+3)² fully but only partially.

b)

  • (x+3)² = (a+b)² = a² +2ab +b²
  • (x+3)² = x² + 2*x*3 +9
  • (x+3)² = x² + 6x + 9

User Rico Yao
by
9.0k points
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Abdullag expands (x+3)² and gets the answer x²+9. a) Describe what he has done wrong b) Expand (x+3)² and simplify
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