Find the value of the expression 2(a + ab + 3) - ab when a = 5 and b = - 3.

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Solution

2(a + ab + 3) - ab
= 2a + 2ab + 6 - ab
= 2a +( 2ab - ab) + 6
= 2a + ab + 6
[2 mark]
Substituting a = 5, b = - 3 in the above expression,
= 2(5) + (5)(-3) + 6
= 10 - 15 + 6
= 16 - 15
= 1
[1 mark]

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