Question

teorema de pitagoras : hipotenusa 4 , cateto √7 , cateto x

Answer 1

4•4=√7•√7+x^2
16-7=x^2
9=x^2
-------
x=√9
x=3

Answer 2

h² = c² + c²
4² = (√7)² + x²
16= 7 + x²
 x² = 16 - 7
x² = 9
x = √9 ---> x = 3