1.

7n²-65n+72 splitting

Answer»

hi first we need to MULTIPLY 7 * 72 = 504

deference between this two NUMBERS is 72 - 5 = 65;


now we can start the splitting

7n²-65n+72;

7n²+ 7n - 72N + 72;

now take the common 7n

7n(n + 1) - 72(n + 1)=0;

7n-72=0; n + 1 =0;

7n = 72; n = -1;

n = 72/7; n= -1


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