Question

x(x+10),(x+20),(x+30) find the angle

Answer 1

Answer:

x=(-11+√641)/2

Step-by-step explanation:

According to Angle Sum property of Triangles Sum of all the angles in a traingle = 180°

In this case the three angles are x(x+10),x+20,x+30

x(x+10)+(x+20)+(x+30)=180

⇒x²+10x+x+20+x+30=180

⇒x²+11x+50-180=0

⇒x²+11x-130

⇒x=[-11±√[11²-{4*1(-130)}]]/(2*1)

⇒x=(-11+√641)/2 (∵The Other is negative and angle in triangle can't be negative)