Is my answer correct. If not, what is the answer ? Thank you

P = 3

Q = -4

R = 22

Step-by-step explanation:

Expand both sides and compare coefficients.

5Px^2 -PQx +10x -2Q = 15x^2 + Rx +8

Compare coefficients of x^2

5P = 15  => P = 3

Compare constant terms

-2Q = 8

Q = -4

Compare coefficients of x

-PQ + 10 = R

-(3)(-4) + 10 = R

R = 10 + 12 =22

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)