Simplify the expression and find its value when $a = 5$ and $b = - 3.$
$2 (a^{2} + a b) + 3 - a b$

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Solution

Given that,
$a = 5$ & $b = - 3$
$2 (a^{2} + a b) + 3 - a b$
$\begin{matrix} \Rightarrow 2 (5^{2} + 5 \times - 3) + 3 - (5 \times - 3) \Rightarrow 2 (25 - 15) + 3 - (- 15) \Rightarrow 20 + 3 + 15 = 38 \end{matrix}$
Hence,
We get $= 38$

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Question 10

Simplify the expression and find its value when a = 5 and b = - 3.
$2 (a^{2} + a b) + 3 - a b$

2 (a^{2} + a b + 3)

a b

a = 5

b = - 3

Find the value of expression $(a - b) (a^{2} + a b)$ when a = 3 and b = 2?

a

b

(3 a + 2 b)^{2} + (2 a + 3 b)^{2}

a^{2} + b^{2} = 5

a b = 2

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