Which polynomial is factored completely? 121 x squared + 36 y squared
(4x + 4)(x + 1)
2 x (x squared minus 4)
3 x Superscript 4 Baseline minus 15 n cubed + 12 n squared

9514 1404 393

  a, d

Step-by-step explanation:

We assume you want factors that use real integers.

a) 121x² +36y² . . . . cannot be factored using real numbers

b) (4x +4)(x +1) = 4(x +1)²

c) x(x² -4) = x(x -2)(x +2)

d) x⁴ -15n³ +12n² . . . . cannot be factored*

* If the polynomial is n⁴ -15n³ +12n², then it factors as n²(n² -15n +12).

answer: c

step-by-step explanation: because you don't have to draw a point of intersection. couldyou give me brainliest?

u

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.