Question

5x2+2x-1

Answer 1

What about it?

Answer 2

Did you mean\[5x^2 + 2x - 1\]

Answer 3

Are you factorising it?

Answer 4

if your trying to factorising it then this is how you would do it:

When in doubt about factoring, "complete the square"
... y = 5x^2 + 2x - 1
or y = 5 ( x^2 + (2/5)x - 1/5 )

... x^2 + (2/5)x = 1/5
or x^2 + 2(x)(1/5) = 1/5
or x^2 + 2(x)(1/5) + (1/5)^2 = (1/5)^2 + 1/5
or (x + 1/5)^2 = 6/25
or x + 1/5 = ± 1/5 √6
or x + 1/5 ± 1/5 √6

or y = 5 ( x + 1/5 - 1/5 √6 )( x + 1/5 + 1/5 √6 )
or y = (1/5) (5x+1-√6) (5x+1+√6)

Answer 5

let x=6, then evalute the expression

Answer 6

Okay, so that is \[5(6)^2+2(6)-1 = \]