Question

Evaluate : 4a + 3b – 8 when a = 3 , b = − 5.

Answer 1

Answer:

The value is -11

Step-by-step explanation:

4a + 3b – 8

Put a = 3 , b = − 5

4(3) + 3(-5) - 8

= 12 - 15 - 8

= 12 - 23

= -11

Answer 2

The value of 4a + 3b – 8 is - 11 when a = 3 , b = − 5 .

Concept used:

First, substitute the given values in the given expression and then simplify it.

Given: 4a + 3b – 8 when a = 3 , b = − 5

To find: The value of 4a + 3b – 8

Solution:

Step1: Substitute the value of a = 3 , b = − 5 in the given expression 4a + 3b – 8:

$4a + 3b - 8 = 4 \times 3 + 3 \times -5 - 8 \\\\4a + 3b - 8 = 12 - 15 - 8$

Step2: Simplify the above expressions:

4a + 3b – 8 = - 3 - 8

4a + 3b – 8 = -11

Hence, the value of 4a + 3b – 8 is - 11 when a = 3 , b = − 5.

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