Simplify the expression and find its value when a= 5 and b =-3: 2(a²+ab)+3-ab

Given: 2(a²+ab)+3-ab
⇒ 2a²+2ab+3-ab
⇒ 2a²+2ab-ab+3
⇒ 2a²+ab+3
⇒ 2(5)² + (5)(-3)+3 [Putting a = 5 , b = -3 ]
⇒ 2 x 25 – 15 +3
⇒ 50 – 15 + 3
⇒ 38

Class 7 Maths Chapter 12 Exercise 12.3

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