Question

find the value of 5x -4x2 +3 at x=1​

Answer 1

Answer:

-23

Step-by-step explanation:

Let the given polynomial be f ( x ) .

f ( x ) = 5 x - 4 x² + 3

When x = 1

f ( 1 ) = 5 (1) - 4 (1)² + 3

⇒ f ( 1 ) = 5 - 4 + 3

⇒ f ( 1 ) =  1 + 3

⇒ f ( 1 ) = 4

The value will be 4.

When x = - 2

f ( - 2 ) = 5 (-2) - 4 (-2)² + 3

⇒ f ( - 2 ) = - 10 - 4 × 4 + 3

⇒ f ( - 2 ) = - 10 - 16 + 3

⇒ f ( - 2 ) = - 26 + 3

⇒ f ( - 2 ) = - 23