Question

find the value of the polynomial 5x-4xsquare+3 and x=2 and x=-1​

Answer 1

Answer:

$5x - 4 {x}^{2} + 3 \\ putting \: x = 2 \\ = 5 \times 2 - 4(5)^{2} + 3 \\ = 10 - 4(25) + 3 \\ = 10 - 100 + 3 \\ = - 90 + 3 \\ = - 87 \\ now \: putting \: x = - 1 \\ 5x - 4 {x}^{2} + 3 \\ = 5( - 1) - 4 ({ - 1})^{2} + 3 \\ = - 5 - 4(1) + 3 \\ = - 5 - 4 + 3 \\ = - 9 + 3 \\ = - 6$

This should be correct answer