Question

21(-k-4x)-7(-3k+10x)= 2) 12(-2y+4k)-2(-10y-12k)=​

Answer 1

Ответ:

Пошаговое объяснение:

21(-k-4x)-7(-3k+10x)= -21k - 84x + 21k - 70x = -154x

2) 12(-2y+4k)-2(-10y-12k)=​ -24y + 48k + 20y + 24k = -4y + 72k

Answer 2

Let's simplify each of these equations step by step:

1. 21(-k-4x) - 7(-3k+10x)

First, distribute the constants (21 and -7) to the terms inside the parentheses:

= 21 * -k - 21 * 4x - 7 * (-3k) - 7 * 10x

Now, simplify each term:

= -21k - 84x + 21k - 70x

Notice that the -21k and +21k cancel each other out. Now, combine like terms:

= -84x - 70x

= -154x

So, the simplified expression for the first equation is:

-154x

2. 12(-2y+4k) - 2(-10y-12k)

First, distribute the constants (12 and -2) to the terms inside the parentheses:

= 12 * (-2y) + 12 * 4k - 2 * (-10y) - 2 * (-12k)

Now, simplify each term:

= -24y + 48k + 20y + 24k

Now, combine like terms:

= (-24y + 20y) + (48k + 24k)

= -4y + 72k

So, the simplified expression for the second equation is:

-4y + 72k