Expand. Your answer should be a polynomial in standard form. (d^2+3)(d^2+2d+1)=(d 2 +3)(d 2 +2d+1)=left parenthesis, d, squared, plus, 3, right parenthesis, left parenthesis, d, squared, plus, 2, d, plus, 1, right parenthesis, equals

Step-by-step explanation:

(d²+3)(d²+2d+1) = d²(d²+2d+1) + 3(d²+2d+1)

= (d⁴+2d³+d²) + (3d²+6d+3)

= d⁴+2d³+4d²+6d+3

A= d^4-d^2-6

Step-by-step explanation:

I have khan academy and the other answer is wrong

for any of you who need the translation here it is

step-by-step explanation:

find the angular size of the equatorial radius of the earth, if the horizontal parallax of the sun

each side has a different length.  

step-by-step explanation: