Hi i wanna know if this is correct (x^2-4x)^2+7x^2-28x+12=0 I got: x^4-x^2-28x=-12 please help me

I think that this is correct: x^4 - 8x^3 + 7x^2 - 28x + 28

Step-by-step explanation:

Take (x^2-4x)^2 and break it up to solve

(x^2-4x)(x^2-4x)=x^4-8x^3+16x

Then bring in the rest of the equation and add and subtract to solve

x^4-8x^3+16+7x^2-28x+12=x^4-8x^3+7x^2-28x+28

24

step-by-step explanation:

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870