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nalin [4]
3 years ago
11

Evaluate 2b^2-4a+4a^2 for a= 3 and b= -8

Mathematics
2 answers:
JulijaS [17]3 years ago
8 0

Hey there!!

The given equation : 2b² - 4a + 4a²

Where, a = 3 and b = -8

Now, we will have to substitute these values in the equation given above

2 ( - 8 )² - 4 ( 3 ) + 4 ( 3 ) ²

( -8 )² = 64

Because -8 × -8 = 64 . As ( - ) × ( - ) = ( + )

negative × negative = positive

Now, moving on

2 ( 64 ) - 4 ( 3 ) + 4 ( 9 )

128 - 12 + 36

116 + 36

<h2>The required answer is 152. </h2><h3>Hope my answer helps!!</h3>
masha68 [24]3 years ago
5 0
Given a = 3 and b = - 8 ,


= > 2b² - 4a + 4a²

= > 2( - 8 )² - 4( 3 ) + 4( 3 )²

= > 2( 64 ) - 4( 3 ) + 4( 9 )

= > 128 - 12 + 36

= > 116 + 36

= > 152



\:


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Ivanna is a software saleswoman. Let y represent her total pay (in dollars). Let x represent the number of copies of History is
artcher [175]

1. For every extra copy, Ivanna sells she gets an additional 120 dollars (+$120) and for every less copy she loses $120 dollars (-$120).

2. Ivanna's total pay is $2,400 if she doesn't sell any copies of History is Fun.

Step-by-step explanation:

Step 1:

y = 2,400 + 120x, where y is Ivanna's total pay and x is the number of copies of history is fun she sells.

To calculate the change is Ivanna's pay we find the difference in pay for two consecutive values of y.

We must calculate y when x is of consecutive values i.e. 1, 2, 3, 4 ...

Step 2:

We calculate the value of y when x = 1, 2 and 3.

When x = 1, y = 2,400 + 120 (1) = 2,400 + 120 = $2,520.

When x = 2, y = 2,400 + 120 (2) = 2,400 + 240 = $2,640.

When x = 3, y = 2,400 + 120 (3) = 2,400 + 360 = $2,760.

Step 3:

To calculate the increase in her pay for a copy, we subtract y when x = 2 from y when x = 3.

(y when x = 3) - (y when x = 2) = $2,760 - $2,640 = $120.

So for every extra copy, Ivanna gets an extra $120.

To calculate the decrease in her pay for a copy, we subtract y when x = 3 from y when x = 2.

(y when x = 2) - (y when x = 3) = $2,640 - $2,760 = -$120.

So for every less copy, Ivanna loses $120.

Step 4:

To calculate her pay when she doesn't sell any copies of history is fun, we substitute the value of x as 0 in y.

When x = 0, y = 2,400 + 120 (0) = $2,400.

So Ivanna earns $2,400 if she doesn't sell any copies of history is fun.

8 0
3 years ago
Hi what is answer plz
34kurt
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