Use PEMDAS to solve the equation.
Multiply 12.6 by 12.6, and then 21 by 21.
12.6 × 12.6 = 158.76
21 × 21 = 441
The equation is now 158.76 + 441. Add the two together.
158.76 + 441 = 599.76
Now divide 599.76 by 2 to find x.
599.76 ÷ 2 = 299.88
Answer:
x = 299.88
