What is the solution of 6a+7b+20=0, ab, if a=5, b=7?

 We are given the equation 6a+7b+20=0 and we are also given the values of a and b as a=5 and b=7.

To find the solution for ab, we can substitute the given values of a and b into the equation and solve for ab as follows:

6(5) + 7(7) + 20 = 0 // substitute a=5 and b=7 30 + 49 + 20 = 0 99 + 20 = 0 119 = 0 // This is a contradiction and implies that there is no solution for ab.

Therefore, the solution for ab is undefined.

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