bananarocks06 bananarocks06

11-05-2019
Mathematics

contestada

If a+b = 11 and a−b = 7, then ab

Respuesta :

MohamedSobhy MohamedSobhy

11-05-2019

Answer is..

ab= 18

Explanation..

a + b = 11...---> a= 11-b

a -b = 7

11 - b - b = 7

11 - 2b = 7

2b = 18

b = 9

and a = 11 - 7

a = 2

So

ab = 2 * 9 =18

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