Question

5. Simplify the expression and find its value when a=5 and b=-3
2(a²b+ab)+3-ab.​

Answer 1

Answer:

- 162

Step-by-step explanation:

Given : a = 5, b = - 3

Expression : 2(a²b + ab) + 3 - ab

Putting known values, we get

→ 2[(5)²(- 3) + (5)(- 3)] + 3 - (5)(- 3)

→ 2[(25)(- 3) + (- 15)] + 3 - (- 15)

→ 2[(- 75) + (- 15)] + 3 - (- 15)

→ 2[- 75 - 15] + 3 + 15

→ 2[- 90] + 18

→ - 180 + 18

→ - 162

Answer 2

Answer:

$\large\boxed{\sf{-162}}$

Step-by-step explanation:

Given an expression :

$\sf{2( {a}^{2} b + ab) + 3 - ab}$

We have to find the value when :

• a = 5
• b = -3

Simply, putting the respective values,

$= 2\left[ {(5)}^{2} \times ( - 3) +(5 \times ( - 3))\right] + 3 -\left[ 5 \times ( - 3)\right]\\ \\ = 2\left[25 \times( - 3) + ( - 15)\right] + 3 - ( - 15) \\ \\ = 2( - 75 - 15) + 3 + 15 \\ \\ = (2 \times ( - 90)) + 3 + 15 \\ \\ = - 180 + 15 + 3 \\ \\ = - 180 + 18 \\ \\ = - 162$