Well, darling, 30N plus 8N equals 38N. It's not rocket science, just basic addition. So, there you have it, 38N in all its glory.
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30N + 8N = 30xN + 8xN
so..
30xN + 8xN = 38xN
Example (using N as 10)
30 x 10 = 300 and 8 x 10 = 80, add them together you get 380
or..
38 x 10 = 380
3n2-8n+4 = (3n-2)(n-2) when factored
It is: -3+8n-5 = 8n-8 when simplified
n=10/7. i did this one mentally. but are you sure its 8n minus negative 4n or is it 8n minus 4n? 8n- -4n does not equal 8n-4n 8n- -4n is the same as 8n+4n
3 + 8n = -58n = -8n = -1
8n-4n4+19n = 27n-4n4