Question

Solve for x.

3x^2 – 75 = 0

A.
{25, –25}

B.
{25}

C.
{5}

D.
{5, –5}

Answer 1

Ok first we ad 75 on both sides right @♥Ashley♥

Answer 2

what will we have left

Answer 3

3x^2=0+75

Answer 4

no we add 5 on both sides s the 0 is gone right?

Answer 5

yes

Answer 6

so we are left with

3x2=75

Answer 7

What do we do next @♥Ashley♥

Answer 8

Divide 3x^2 on both sides

Answer 9

yes an what do u get

Answer 10

3x2−75=0 <---equation

Add 75 to both sides
3x2=75
Divide both sides by 3
x2=75/3
Simplify 75/3 to 25
x2=25
Take the square root of both sides this way we get rid of x^2
x=±25
Simplify the square root of 25 to 5
x=±5

Answer 11

No we actually divide by 3 on both sides

Answer 12

@kidrah69 it better to guide them to the answer, not doing it for them

Answer 13

I did not give them the answer :) i showed my work

Answer 14

And they will better understand if it is split into steps :)

Answer 15

75/3=25

Answer 16

Do you understand

Answer 17

So the answer is 25 right

Answer 18

@♥Ashley♥ no whats the square root of 25

Answer 19

5

Answer 20

yeah its positive negative 5

Answer 21

since we square rooted it :) look at my work above

Answer 22

Thanks everyone! That was helpful!

Answer 23

=)