20n2+6n-2 (4n + 2)(5n -1)
This problem can be solved by FOILing. First, multiply the first terms to get 20n2
Next, multiply the outside terms to get -4n. Multiplication of the inside terms results in 10n. Combining -4n and 10n (they are like terms) is 6n. Then, multiply the last terms, to get -2. Combining these answers into one equation gives the answer of 20n2+6n-2.
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15m + 4n - 5m + 9n = 10m + 13n
7m2 + 6.5n - 4n + 2.5m2 - n = 9.5m2 + 1.5n
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
-4n3 + 8n2 - 4n + 7
-2.18