Question

Find the roots of the equation x²-16=0​

Answer 1

Step-by-step explanation:

x² - 16 = 0

x² = 0 + 16

x² = 16

x =

x = 4

Answer 2

Step-by-step explanation:

Since x^2 — 16=0 we can move 16 to the RHS that is the right hand side of the equation. This causes the sign of 16 to change. That is it will become +16 on RHS when it had been -16 on the LHS that is the left hand side.

Now we have,

X^2=16 that is 16 is the square of x. This is a perfect root that is it has a whole number as its root. 4×4 that is 4^2 =16 so x=4

However -4×-4 is also 16

So x can also be -4 so the values of x can be 4 and -4.

Heres the squares of 1 to 15 if you need help.

1×1=1

2×2=4

3×3=9

4×4=16

5×5=25

6×6=36

7×7=49

8×8=64

9×9=81

10×10=100

11x11=121

12×12=144

13×13=169

14×14=196

15×15=225