2x² + 9 = - 7x
how do i find an answer using the quadratic formula

(-7 ± √(-23)) / 4

Step-by-step explanation:

Unless you have to show your work, you don't really have to use the quadratic formula unless it is unfactorable.

2x² + 9 = -7x    (Add 7x to both sides)

2x² + 7x + 9 = 0    ( The quadratic formula is (-b ± √(b^2 - 4ac))/2a )

A = 2

B = 7

C = 9

(-7 ± √(49 - 72))/4

= (-7 ± √(-23))/4    (Which simplifies to an imaginary answer, proving that this is, indeed, unfactorable)

= (-7 ± √(-23))/4

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.