Question

find the roots of y^2 mod - y mod -12=0

Answer 1

Answer:

+4 and -4

Step-by-step explanation:

|y^2| - |y| - 12 = 0

we can say |y^2| = |y|^2 = y^2.

let |y| = k.

k^2 - k -12 =0

k^2 - 4k + 3k - 12=0

k(k-4) + 3(k-4) =0

(k-4)(k+3)=0

:• k = 4 or k = -3

|y| = 4 or -3

(. |y| can't be negative)

so, neglect -3.

=> |y| = 4

=> y = -4 or 4