Question

Select the two values of x that are roots of the given polynomial below.

2x^2 + 11x + 15

Answer 1

you can either solve the equaton or plug in the given roots and see which fit.

Answer 2

it will b easier to solve.

Suggest you Use the quadratic formula

Answer 3

or do you think you can factor it?
Have you heard of the ac method of factoring these equations?

Answer 4

no i have not...

Answer 5

Ok then how about the quadratic formula?

Answer 6

i think this is it? a x 2 + b x + c = 0

Answer 7

No that is the general form of the equation
quadratic formula is x = [-b +/- sqrt(b^2 - 4ac) ] / 2a

Answer 8

oh okay

Answer 9

so plug in the values of a b and c

Answer 10

and youll get the roots.

Answer 11

x = [-11x +/- sqrt(11x^2 - 4a15) ] / 2a (is that right?)

Answer 12

no you dont include the x
a = 2 , b = 11 and c = 15

Answer 13

x = [-11 +/- sqrt(11^2 - 4*2*15) ] / 2*2 (idk if im supposed to put ^ between a c or *)

Answer 14

* is correct Multiply

Thats corrrect

Answer 15

can you work it out?

Answer 16

when i did it all i got 10... idk if thats right or not.... i really suck at these problems

Answer 17

x = [-11 +/ - sqrt(121- 120)] / 4

= (-11 + 1] / 4 or (-11 - 1) / 4

Answer 18

-3 and -5/2

Answer 19

right

Answer 20

-5/2 isnt an option ... but -2.5 is

Answer 21

It is D and E ...

Answer 22

-5/2 is the same as -2.5

Answer 23

exactly...

Answer 24

Oh okay thank you both cx

Answer 25

yw