How do you simplify simplify 6x7y4(2x4-5xy) How do you simplify 25x9 -10x35x3 how to simpllify x2-12x plus 3549-x2 and simplify x-7x2-4x-21?

Answer 1

In the future, ask four questions as four separate questions to limit confusion.

6x7y4(2x4 - 5xy) could be written as 6x8y4(2x3 - 5y) Either way, once you carry out the multiplication, it becomes 12x11y4 - 30x8y5

I'm guessing the second problem is 25x9 - 10x3 + 5x3 since this website can't reproduce plus signs.

That becomes 25x9 - 5x3 which factors to 5x3(5x6 - 1)

x^2 and -x^2 cancel each other out, leaving 3549 - 12x which factors to 3(1183 - 4x)

-7x^2 - 3x - 21 can be written as -(7x^2 + 3x + 21) but the solution isn't rational.