Step-by-step explanation:
px^2-qx+r
p(x^2-q/px)+r
p[(x^2-q/px +(q/2p)^2_(q/2p)^2)]+r
p[(x-q/2p)^2 -q^2/4p^2)]+r
p(x-q/2p)^2 -q^/4p+r
p(x-q/2p)^2-(q^2-4pr)/4p
All the angles in a triangle add up to 180 degrees
40+90=130
180-130=50
The missing angle is 50 degrees
Answer:
10
Step-by-step explanation: