Question

find the sum of zero of quadratic polynomial 3x 2 + 15 x +7​

Answer 1

Answer:

Answer is -5

Step-by-step explanation:

Given 3x²+15x+7 zeros (roots) of this Quadratic Expression

=3x²+15x+7

=roots of 3x²+15x+7 can be solved the formula

= -b+(b²-4ac)½ / 2a

= -15+(15²-4(3)(7))½ / 2(3)

= -15+(225-84)½ / 6

= -15+(141)½/6 and other root is -15-(141)½/6

= Sum of the zeroes is

=(-15+(141)½/6)+(-15-(141)½/6)

= -15+(141)½/6-15-(141)½/6

= -30/6

= -5

Answer 2

Answer:

sum of zero = -b/a OR -coefficient of x/coefficient of x2

-b/a = -15/3

= -5

I hope your doubt had clear