Multiple choice

If a2 + 2ab + b2 = 49 then (a + b) is

  1. 17

  2. 7

  3. 23

  4. 98
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The expression a^2 + 2ab + b^2 is the expansion of (a + b)^2. Since (a + b)^2 = 49, taking the square root gives a + b = 7 (assuming positive values).

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