Question

if x is equals to 27 by 3 and X is equals to minus 3 are the roots of equation a x square + 7 x + b is equals to zero find the value of AB​

Answer 1

Answer:

according to question,

the roots of this equation are

9 and -3, so,

sum of roots = 9 + (-3) = 6

product of roots = 9 × (-3) = (-27)

so,

-7/a = 6

a = -7/6

and

b/a = (-27)

b/(-7/6) = (-27)

b x (-6/7) = (-27)

b = (-27) ÷ (-6/7)

b = (-27) × (-7/6)

b = -9 × (-7/2)

b = 63/2

ab = (-7/6) x (63/2)

ab = (-7/2) × (21/2)

ab = (-147/4)