Question

Simplify the polynomial, then evaluate for x=3 x^2+2x-3-2x^2+x+4

Answer 1

Answer:

$x=-1$

Step-by-step explanation:

$x=3 x^2+2x-3-2x^2+x+4$

$x=x^2+3x+1$

$0=x^2+2x+1$

Luckily we can factor it:

$0=(x+1)^2$

$x=-1$

Answer 2

Answer:

The answer is

19

Step-by-step explanation:

x² + 2x - 3 - 2x² + x + 4

Group like terms

That's

x² - 2x² + 2x + x - 3 + 4

Simplify

- x² + 3x + 1

when x = 3

We have

(-3)² + 3(3) + 1

9 + 9 + 1

18 + 1

19

Hope this helps you