Question

. If -1 is a factor of ax^2 + bx + c then value of a+c is


b

2b

C

O

Q8. The roots of. x^2-5x+6 are 

3,2

-3,-2

-3,2

3,-2

Q9. 3√2 is *


Natural number

Rational number

Irrational number

None

Q 10. If the sum and product of zeroes of3x^2+lx+m are equal then the value of l+ m is

0

1

2

3​

Answer 1

hey mate hope the answer helps

1. if -1 is the zero of polynomial then

a(-1)^2+b*-1+c=0

then, a-b+c=0

so a+c= b

3.the question says that

alpha+ beta= alpha *beta

now, alpha + beta= -b/a

alpha* beta= c/a

therefore. -b/a= c/a

so -b=c

now -l= m

so l+m =0

therefore l+m = 0

2. the roots of x^2-5x+6

x^2-2x-3x+6

x(x-2) -3(x-2)

(x-2)(x-3)

the zeros are 2,3