If a + b = 4 and a – b = 3, then a 2 + b 2 = _______
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- a+b =4. a-b=3.
- Hence. a=3.5 b =0.5
- a2 + b2 = (a+b)2 -2ab
- = (4)2 - 2x3.5x0.5=16 - 3.5= 12.5
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