Question

Which of the following are solutions to the equation below?

Check all that apply.

25x2 - 50x + 21 = 0

Answer 1

@Directrix @mathmale @rebeccaxhawaii

Answer 2

@563blackghost

Answer 3

You can either plug in each of the options into the equation and see which ones fit, or you can try to solve the equation.

Answer 4

HOW DO U PLUG IT INTO THE EQUATION

Answer 5

ok take the first option 7/5
replacing the x by 7/5
we have

25 * (7/5)^2 - 50(7/5) + 21

work that out using your calculator and see if it comes to 0

If it does you've found the correct option.

Answer 6

i got 0

Answer 7

but are you familiar with the process of solving these equataions?

Answer 8

i think i do now

Answer 9

its the same for the other ones too?

Answer 10

yea 7/5 is one solution.

Answer 11

i tried B and also got 0

Answer 12

you can do same with the others yes.

When i mean solving I'm talking about factoring the equation or using the quadratic formula.

Answer 13

no i do not

Answer 14

are A and B the only options

Answer 15

cuz those are the only 2 i got

Answer 16

OK well you have finished.
These quadratic equations ( where you have x^2 as highest degree) have 2 roots

Answer 17

luckily the first 2 were the correct roots.

Answer 18

are those the only 2?

Answer 19

yes

Answer 20

all the other ones were not 0

Answer 21

i just want to check

Answer 22

tyvm

Answer 23

you neednt check the rest cos you have found the roots already.

Answer 24

yw

Answer 25

it factors to (5x - 3)(5x - 7) = 0

so x = 3/5 , 7/5

Answer 26

Check all that apply.

x2 + 14x + 40 = 0

A. -5
B. -10
C. 10
D. 5
E. 4
F. -4

Answer 27

so x is the opions and i see which one is 0

Answer 28

i didnt get 0 for any of them

Answer 29

im stuck on this one