Question

1). 12x-(4x+4)=9(1-2x)2). (4-y)(4+y)-2y(2y²-1)+4y³!!!!СРОЧНО !!!!

Answer 1

1) 12x-(4x+4)=9(1-2x)
12x -4x-4=9-18x
8x-4=9-18x
8x+18x=9+4
26x=13
x=1/2

2) (4-y)(4+y)-2y(2y²-1)+4y³
16-y²-4y³+2y+4y³
-y²+2y+16

Answer 2

Sure, let's solve each of the given equations step by step:

1. Solve the equation: 12x - (4x + 4) = 9(1 - 2x)

To solve the equation, first simplify the left side:

12x - (4x + 4) = 12x - 4x - 4 = 8x - 4

Now simplify the right side:

9(1 - 2x) = 9 - 18x

Now the equation becomes:

8x - 4 = 9 - 18x

Next, let's isolate the variable (x) on one side of the equation. To do that, we can add 18x to both sides and add 4 to both sides as well:

8x + 18x = 9 + 4

Combine the x terms:

26x = 13

Finally, divide both sides by 26 to solve for x:

x = 13 / 26

Simplify the fraction:

x = 1 / 2

So the solution to the equation is x = 1/2.

2. Solve the expression: (4 - y)(4 + y) - 2y(2y² - 1) + 4y³

Let's simplify the expression step by step:

Step 1: Expand the first bracket (4 - y)(4 + y)

(4 - y)(4 + y) = 4 * 4 + 4 * y - y * 4 - y * y = 16 + 4y - 4y - y² = 16 - y²

Step 2: Expand the second bracket -2y(2y² - 1)

-2y(2y² - 1) = -2y * 2y² + (-2y) * (-1) = -4y³ + 2y

Step 3: Now, we have: (16 - y²) + (-4y³ + 2y) + 4y³

Step 4: Combine like terms:

The -y² and +4y³ terms will cancel each other out when combined.

16 + 2y + 4y³

So, the simplified expression is 16 + 2y + 4y³.

Note: The expression does not have an equal sign, so it's not an equation to be solved for a specific value. Instead, it's just a simplified expression: 16 + 2y + 4y³.