Final answer:
To find the value of x in triangle DEF, set up an equation using the given angle measurements and solve for x.
Step-by-step explanation:
To find the value of x in triangle DEF, we can set up an equation using the given angle measurements. The sum of the angles in a triangle is always 180°, so we have the equation:
(4x)° + (2x - 3)° + (x + 8)° = 180°
Simplifying the equation gives:
7x + 5 = 180
Subtracting 5 from both sides gives:
7x = 175
Dividing both sides by 7 gives:
x = 25