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Here, a*b = a + b x a - b
a) 2*(-3)
= 2+(-3) x 2-(-3)
= 2-3 x 2 + 3
= 2 - 6 + 3
= 5-6 = -1.
b) (-5)*(-7)
= -5+(-7) x (-5)-(-7)
= -5-7 x (-5)+7
= -5+35+7
= 37.
c) {-4*7} *(-2)
= { -4+7 x -4-7}*(-2)
= { -4-28-7 } * (-2)
= { -39 } * (-2)
= -39 + (-2) x (-39)-(-2)
= -39+78+2
= 41.
d) { -4+7 } * (-2)
= 3*(-2)
= 3+(-2) x 3-(-2)
= 3-6+2
= 5-6
= -1.
Hope you will find it helpful.
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