Answer ↓
z = 7, z = -7
Calculations ↓
z² = 49
Take the square root of both sides to find what z equals
z = 7
Is that the only solution? Is 7 the only number that can be multiplied by itself and have a result of 49? No, there's another number. This number is -7.
So the solutions are ↓
7, -7
hope helpful ~