Question

Given a* b=ab + 1, evaluate 4*((6*8)+(3*5)).

Answer 1

a * b = ab + 1

First solve the ones in the bracket

4 * (( 6 * 8) + ( 3 + 5))

(6 * 8 ) = 6(8) + 1 = 48 + 1 = 49

(3 * 5) = 3(5) + 1 = 15 + 1 = 16

(6*8) + (3*5) = 49 + 16 = 65

So now

4 * 65 = 4(65) + 1 = 260 + 1 = 261

Therefore

4*((6*8)+(3*5)) = 261

Hope this helps.