Question

The value of (3a – 4b + 2) × (5a + 6) for a = 1 and b = -2 is ………………

Answer 1

Answer:

405

Step-by-step explanation:

(3a-4b+2) times (5a+6)

= 3 x 1 - 4 x -2 +2

=3-(4 x -2) +2

=3- (-4) +2

=3+4+2=9

first answer =9

5a x 6

=5 x 1 x 6

=45

second answer =45

=9 x 45 = 405

therefore answer =405

Answer 2

Given:

The value of a = 1 and b = -2.

To find:

The value of (3a – 4b + 2) × (5a + 6).

Solution:

The value of the given expression is 143.

To answer this question, we will follow the following steps:

As given, we have,

The value of a = 1

The value of b = -2

Now,

We will put the value of a and b in the given expression (3a – 4b + 2) × (5a + 6)

So,

We have

$(3a \: – \: 4b \: + \: 2) × (5a \: + \: 6)$

as a = 1, b = -2,

So,

$[3(1) - 4( - 2) + 2] \times [5(1) + 6]$

On solving the above,

We get,

$= (3 + 8 + 2) \times (11)$

$= 13 \times 11$

$= 143$

Hence, the value of (3a – 4b + 2) × (5a + 6) is 143.