Great solution. You don't need to divide 2x on both sides because there is no restriction that x is not zero. Dividing zero is not possible. The safest way is to directly equate 2n and 19, that is, 2n = 19 which implies n = 19/2 and further implies that n^2 = 361/4.
Dividing by X is not permitted unless you set X to be different from 0, you should focus more on conditions of existence and conditions of acceptability
2 дні тому+1
Fun fact: calculating the solution in decimal is not harder. 19/2 = 9.5 9.5^2 = (9.5*10)^2/10^2 = 95^2/100 = (9*10&25)/100 = 9025/100 = 90.25 And for check: 361/4 = 360/4 + 1/4 = 90 + 0.25 = 90.25
At 0:39 when this girl says "set them equal to each other." she meant subtract n^2 and x^2 on both sides, that is, getting rid of the n^2 and x^2, and solve for *n* alone! Very badly said!
I forgot that we needed n^2 instead of just n so I spent a few minutes confused on what did I do wrong lol.
Great solution.
You don't need to divide 2x on both sides because there is no restriction that x is not zero. Dividing zero is not possible.
The safest way is to directly equate 2n and 19, that is,
2n = 19 which implies n = 19/2 and further implies that n^2 = 361/4.
“Can you crack this SAT question” no, now let me finish explaining the destiny lore-
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(x+n)²= x²+19x+n²
x²+2nx+n² = x²+19x+n²
2n= 19
n = 19/2
n² = (19/2)²
n²= 361/4
Nice one! Thanks.
Dividing by X is not permitted unless you set X to be different from 0, you should focus more on conditions of existence and conditions of acceptability
Fun fact: calculating the solution in decimal is not harder.
19/2 = 9.5
9.5^2 = (9.5*10)^2/10^2 = 95^2/100 = (9*10&25)/100 = 9025/100 = 90.25
And for check: 361/4 = 360/4 + 1/4 = 90 + 0.25 = 90.25
When in doubt, go C
IS IT REALLY A SAT QUESTION??
great
Don’t worry the teachers were right, you’ll need to know this in your everyday life
x^2 + 2xn + n^2 = x^2 + 19x + n^2
Removing duplications gives
2xn = 19x
Then
2n = 19
n = 19/2
So n^2 = 361/4
Answer c}
At 0:39 when this girl says "set them equal to each other." she meant subtract n^2 and x^2 on both sides, that is, getting rid of the n^2 and x^2, and solve for *n* alone!
Very badly said!
This is absurd, every value for n works if x=0, the question is incorrect. You get it because you divide by x, which you cannot do
The question is asking for the value of n^2 for all values of x. though it is not explicitly stated, the framing of the question makes it clear.
@@Smugly33810
You're right that this is the meaning of the question, but the question is mathematically incorrect.
361/4
I am 9 and got it
Stop the cap
@ I did get it
@mikeygamer21Good job 🎉
NICEEE!