Choose the expression that represents a quadratic expression. 9x − 2 5x2 + 9x − 1 −2x3 + 8x2 − 7x + 1 x4 − 12x3 + 8x2 − 7x + 1

Question

asked May 18, 2020 21.3k views

2 Answers

Suleika · Answer 1 · 2020-05-22T14:09:14+0000

Answer:

$5 {x}^(2) + 9x - 1$

Explanation:

A quadratic expresion is of the form

$a {x}^(2) + bx + c$

where

$a \\e0$

The give options are:

9x-2

$5{x}^(2)+9x - 1$

$-2x^3+8 {x}^(2) -7x +1$

$x^4-12x^3+8 {x}^(2) -7x +1$

From the given options, the only expression which is quadratic is

$5 {x}^(2) + 9x - 1$

where a =5, b=9 and c=-1

Therefore the correct choice is the second option.