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a + b = 20

ab = 96

a = 20 - b

( 20 - b ) b =  96

- b² + 20 b - 96 = 0

Δ = 400 - 4 ( - 1 * - 96 ) = 400 - 384 =  16

x 1 = ( - 20 - √16) / - 2 = - 24 / - 2 =  12

x 2 =  ( - 20 + √16) - 2  = - 16 /- 2 =  8

12 + 8 = 20

12 * 8 = 96  

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