Question

if one by Alpha is a root of the equation 2 x square - 5 x + 7 equal to zero then the value of 7 alpha square minus 5 Alpha is​

Answer 1

Answer:

-2

Step-by-step explanation:

2x^2-5x+7= 0

$1/\alpha$ is a root of the given equation so if we put value of root in equation then equation will become zero

so

2/$\alpha$^2 -5/$\alpha$ + 7 = 0

multiplying both sides by $\alpha$ ^2

2 - 5 $\alpha$ + 7$\alpha$^2= 0

7 $\alpha$^2 -5 $\alpha$ = -2

so value = -2