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AP EAMCET2001MathematicsVector Algebra

If a = i +4 j , b =2 i -2 j , c =5 i +9 j , then c is equal to

Options

  1. A2 a + b
  2. Ba +2 b
  3. C3 a + b
  4. Da +3 b

Correct answer

C. 3 a + b

Step-by-step solution

aligned 3 a + b & =3( i +4 j )+2 i -3 j & =3 i +12 j +2 i -3 j =5 i +9 j = c aligned

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