Factorize some expressions

[pliant juniper]

Hey, I'm a French high schooler. I'm struggling with factorizing, can you help me? the expressions are:
C = (4x + 1) ² - (3x+4) ²
D = 8x² - 4x
E = (4x-1) ² - (x-5) (4x+1)
F = 49x² - 84x + 36

[crystal spruce]

C ) 16x²+8x+1 - (3x+4)²
16x² + 8x + 1 -9x² -24x - 16
7x² -16x - 15

D) 4x(2x-1)

E) 16x²-8x+1 -(x-5)(4x+1)
16x²-8x+1 -4x² +19x + 5
12x² + 11x + 6

F) 49x² = (7x)²
-84x = -2•︎7x•︎6
36 = 6²
(7x)² -2•︎7x•︎6 + 6²
(7x-6)²

[pliant juniper]

It's not factorized bro

[crystal spruce]

Which one

[pliant juniper]

C e f

[crystal spruce]

That’s all I can factorize them

[pliant juniper]

thanks to you i will find another solution

[remote dragon]

@pliant juniper has given 1 rep to @crystal spruce

[crystal spruce]

No problem and sorry if I didn’t solve it in the way you wanted

[pliant juniper]

No problem bro

[manic spoke]

(a+b)(a-b)

for C

(a+b)(a-b) = a^2 - b^2

for d) just break out 4x

[pliant juniper]

I don't know how to do that😅

[manic spoke]

??

4x(2x-1)