Question

1. If y= 3 is a common root of the equation ay2+ ay + 3=0 and y2 + y + b=0,then ab a) 3. b). -7/2 c). 6. d). -3

Answer 1

a) is the correct answer

explaination

If 1 is the root of the given equations then it would satisfy the conditions ;

a(1)^2+a(1)+3 = 0

2a = -3

a = -3/2

(1)^2+(1)+b =0

2 + b = 0

b = -2

ab = (-3/2)×-2

= 3

$\huge\underline\mathbb\red{Answer}$

Answer 2

Answer:

a) 3

Step-by-step explanation:

1)   ay2+ay+3 =0

y=3

a(3)^2 +3a +3 = 0

9a + 3a = -3

12a = -3

a = -3/12

2)   y2 + y+ b = 0

(3)^2 + 3 +b = 0

9+3+b =0

b= -12

hence, ab= -3/12 * -12

ab= 3