Will give brainliest! help pls :)

Step-by-step explanation:

# be careful #STEP

1

:

Equation at the end of step 1

((2•5x2) - 21x) - 10

STEP

2

:

Trying to factor by splitting the middle term

2.1 Factoring 10x2-21x-10

The first term is, 10x2 its coefficient is 10 .

The middle term is, -21x its coefficient is -21 .

The last term, "the constant", is -10

Step-1 : Multiply the coefficient of the first term by the constant 10 • -10 = -100

Step-2 : Find two factors of -100 whose sum equals the coefficient of the middle term, which is -21 .

-100 + 1 = -99

-50 + 2 = -48

-25 + 4 = -21 That's it

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, -25 and 4

10x2 - 25x + 4x - 10

Step-4 : Add up the first 2 terms, pulling out like factors :

5x • (2x-5)

Add up the last 2 terms, pulling out common factors :

2 • (2x-5)

Step-5 : Add up the four terms of step 4 :

(5x+2) • (2x-5)

Which is the desired factorization

Final result :

(2x - 5) • (5x + 2)

the correct is answer is a 9-sided polygon!

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b