Question

Find the value of the polynomial 5x – 4x2 + 3 at x = 2 and x = –1​

Answer 1

Step-by-step explanation:

5x-4x^2+3. when x=2

5(2)-4(2)^2+3= 10-16+3= -3

when x=-1

5(-1)-4(-1)^2+3= -5-4+3=-6

Answer 2

Step-by-step explanation:

5x - 4x^2 + 3

at x=2,

5*2 - 4*2*2 + 3

= 10 - 16 + 3

= 3 +10 -16

= 13-16

= -3

at x = -1

5*(-1) - 4*(-1)*(-1) +3

= -5 -4 +3

= 3 - 5 -4

= -2 -4

= -6