Question

d) 11. The value of the polynomial p(t)= 3-2t +5t^2-7t^2 - 7t^2 for t= 0 is
a) 3
d) 7
b) 2
c) 5​

Answer 1

Answer:

d) 11. The value of the polynomial p(t)= 3-2t +5t^2-7t^2 - 7t^2 for t= 0 is

a) 3

d) 7

b) 2

c) 5

Answer 2

5t² +12t+7=0

5t²+5t+7t+7=0

5t(t+1)+7(t+1)=0

(5t+7)(t+1)=0

$⇒t= \frac{−7}{5} and \: t= −1$

$∴ sum \: of \: roots \: is \: \frac{−7}{5} −1= \frac{−12}{5}$

$= \frac{−b}{a}$

$product \: \: of \: \: roots = ( \frac{−7}{5} )(−1)= \frac{7}{5}$

$=\frac{c}{a}$

Hence verified