Question

Find the value of x³-7x²+5x-3 at x=-1 and 2.

Answer 1

Answer:

At x = 1  ;  -4

At x = 2  ; -13

Step-by-step explanation:

x³ - 7x² + 5x - 3

At x = 1,

x³ - 7x² + 5x - 3

(1)³ - 7(1)² + 5(1) - 3

1 - 7 + 5 - 3

1 + 5 - 7 - 3

6 - 10

-4

At x = 2,

x³ - 7x² + 5x - 3

(2)³ - 7(2)² + 5(2) - 3

8 - 7(4) + 10 - 3

8 - 28 + 10 - 3

8 + 10 - 28 - 3

18 - 31

-13

Answer 2

We solve such questions by putting given values of x in given functions i.e

Like putting x=-1 ;
(-1)^3 - 7(-1)^2 + 5(-1) - 3 = -1-7-5-3 = -16



Now solve x=2 by yourself for practice purpose...