Question

it's urgent solve this question quickly plez ​

Answer 1

Since two sides are equal line with 12 will be perpendicular and angle will be 90°

a² + b² = c²

12² + b² = 15²

144 + b² = 225

b² = 225 -144

b² = 81

b = √81

b = 9

So x is 9+9 = 18

x=18