If (4x + 3y + 9) (3x + 7y – 8) is equal to ax² + by² + cxy + dx + ey – f

If (4x + 3y + 9) (3x + 7y – 8) is equal to ax² + by² + cxy + dx + ey – f, Find the value of  a+b+c/d-e÷f

a) -8.43

b) -9.84

c) -3.64

d) -2.67

 Sol:

(4x + 3y + 9) (3x + 7y – 8) =

21y² + 12x² + 37xy – 5x + 39y – 72 = equation.

a = 12

b = 21

c = 37

d = -5

e = 39 f = 72