Question

7n²-65n+72 splitting

Answer 1

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

Answer 2

Answer:

7n²-65n+72 = 0

7n² - 56n -9n +72 = 0

7n (n-8) - 9 (n-8) = 0

(n-8) (7n-9) = 0

n-8 = 0                                            7n-9 = 0

n = 8  {Right Answer}                n = 9/7 {Not possible}

Hope this is helpfull  !!!

Thank You !!!!