2
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-2=x-4 add two both sides
0=x-2 add two both sides
2=x
(or could have added 4 both sides to begin with). The answer is x =2
N = x4 x8 = x4+4 = (x4)2 = N2
28 is.
yes
(x + y)2 = x2 + 2xy + y2 So x2 + y2 = (x + y)2 - 2xy = a2 - 2b Then (x2 + y2)2 = x4 + 2x2y2 + y4 So x4 + y4 = (x2 + y2)2 - 2x2y2 = (a2 - 2b)2 - 2b2 = a4 - 4a2b + 4b2 - 2b2 = a4 - 4a2b + 2b2
70 ft2 * 4 ft = 19,600 cubic feet