Question

the value of p (x) = x² +7x+1 at x =1 is
(a) 8 (b) -7(c )9 (d )0​

Answer 1

Hey Pretty Stranger!

Here, we're given with p(x) = x² + 7x + 1 and the value of x = 1

Put x = 1

→ p(1) = (1)² + 7(1) + 1

→ p(1) = 1 + 7 + 1

→ p(1) = 9

$\therefore$ Option c), 9 is the required answer.

Answer 2

Answer:

Sum of roots =x

1

+x

2

=−p

product of roots =x

1

x

2

=q

∴x

1

+x

2

=

2x

2

−1

x

2

+4

+x

2

=−p

∴

2x

2

−1

x

2

+4+x

2

(2x

2

−1)=−p

∴

2x

2

−1

2x

2

2

+4

=−p

Now

2x

2

−1

x

2

2

+4x

2

=q

∴2q=

2x

2

−1

2x

2

2

+8x

2

∴2q+p=

2x

2

−1

2x

2

2

+8x

2

+2x

2

2

+4

∴2q+p=

2x

2

−1

4x

2

2

+8x

2

+4

∴2q+p=1

Step-by-step explanation:

hope its help you