The number 64 has two real square roots: +8 and -8. This is because the square root of a number is defined as the value that, when multiplied by itself, gives the original number. For 64, the equation is:
x² = 64
Solving for x, we find:
x = ±√64 = ±8
This means both +8 and -8 are valid solutions because:
(+8)² = 64 and (-8)² = 64.
In summary, while it’s common to refer solely to the positive square root (which is +8), there are indeed two real square roots of 64: +8 and -8.