Math puzzle 1+4 = 5 , 2+5 = 12 , 3 + 6 = 21 , 8+11 = ?

Math puzzle

1+4 = 5

2+5 = 12

3 + 6 = 21

8+11 = 96

Confused? It may be the first line that is throwing you off, as if we use the a + ab equation, 1 x 4 equals 4. However, in the following lines the equation becomes clearer. For instance, 2 + 2(5) equals 12. So when used in the last line, 8 + 8(11), the final answer is 96.

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