Question

2. If a + b = 9 and ab = -22, find
(1) a - b (ii) a2- b2​

Answer 1

Answer:

Step-by-step explanation:

a-b^2=a+b^2-4ab

=81+88=169

a-b=13

a2-b2

a+b(a-b)

9*13

117

Answer 2

Step-by-step explanation:

a+b=9

a=9-b ----------------1.

ab=-22 ---------------2.

put value of @ in 2.

(9-b)×b = -22

9b-b^2 = -22

9b-b^2+22

b^2-9b-22

b^2+2b-11b-22

b(b+2)-11(b+2)

(b+2)(b-11)

b=-2 & b=11

next steps, you can see in picture.