Question

7. If a and b are the roots of the equation x2 - 5x + 7 = 0,
Ahen value of ab(a + b) is : [KSEEB, MARCH 2011]
(a) 5
(b) 25
(c) 351
(d) 49​

Answer 1

Answer:

GIVEN EQUATION:-

X² - 5X + 7 = 0

=》 IT HAVE TWO ROOTS a and b

TO FIND :-

ab(a+b)

SO,

(1) SUM OF ROOTS = a + b = 5

(2) PRODUCT OF ROOTS = a.b = 7

THUS,

ab(a+b) = 7 × 5 = 35

SO, NO OPTION IS CORRECT.

# FOLLOW ME....