Evaluate, Simplify?

Question

Evaluate: 2a^2 - 4a for a = -2

Simplify: -11a - 14b + 6a - 7b

Simplify: 4c - 3c^2 - (4c + 2c^2)

Answer 1

a = - 2

2a² - 4a =

2(- 2)² - 4(- 2) =

2(4) - 4(- 8) =

8 + 8 =

16

- - - - - - - - - - -

- 11a - 14b + 6a - 7b =

- 5a - 21b

- - - - - - - - - - - -

4c - 3c² -(4c + 2c²) =

4C - 3C² - 4C - 2c² =

- 5c²

- - - - - - - - s-

Answer 2

1. 2a^2- 4a for a= -2
ie; replace a for (-2)

[2(-2)^2] - [4(-2)]=

2(4) - 4(-2)=

8+8=16 Ans

2. -11a - 14b + 6a - 7b =

bring the like terms together

-11a + 6a - 14b -7b =

-5a - 21b Ans

3. 4c - 3c^2 - (4c + 2c^2)=

Open the bracket

4c - 3c^2 - 4c + 2c^2 =

4c - 4c - 3c^2 - 2c^2 =

-5c^2 Ans

Answer 3

Evaluate:
2a² - 4a => for a = -2
2(-2)² - 4(-2) = 8 + 8 = 16

Simplify:
-11a - 14b + 6a - 7b
-5a + 21b

Simplify:
4c - 3c² - (4c + 2c²) =
-3c² -2c² = -5c²
::

Answer 4

2a^2 - 4a for a = -2

2*(-2)^2-4*-2 = 8+8=16


-11a - 14b + 6a - 7b simplifies to

-5a-21b collecting a's and b's


Simplify: 4c - 3c^2 - (4c + 2c^2)


opening brackets

4c - 3c^2 - 4c - 2c^2

= -5c^2

Answer 5

1. 2a^2 - 4a

*The problem gives us the value for "a" which is (-2) > take

First: take (-2) and replace it with "a" >>>

= 2(-2^2) - 4 (-2)
= 2(4) + 8
= 8 + 8
= 16

2. -11a - 14b + 6a - 7b

First: combine "like" terms >>>

= - 11a + 6a - 14b - 7b
= -5a - 21b

3. *Just get rid of parenthesis and combine "like" terms...give it a try

Answer 6

1) 2 (-2)^2 - 4 (-2) = 2 (4) +8 = 8+8=16

2) -11a+6a-14b-7b=-5a-21b

3) 4c-3c^2-4c-2c^2 = -3c^2-2c^2=-5c^2

Answer 7

1) [2(-2)^2]-[4(-2)]
=[2*4]+8
=8+8
=16.
2)-11a-14b+6a-7b
=-5a-21b.
3)4c-3c^2-(4c+2c^2)
=4c-3c^2-4c-2c^2
=-5c^2.

Answer 8

From mere inspection we write
1] 8+8=16
2]-5a-21b
3]-5c^2

Answer 9

24
5a-21b
-c^2