Question

Which of the following are solutions to the equation below
7x^2+35x-252=0
A.4
B.-7
C.-4
D.252
E.-9
F.9

Answer 1

@mathmale

Answer 2

You have a choice: You could actually solve the given equation, or you could substitute the possible answers one by one to determine whether any of them is a solution, or you could graph the given equation and determine the roots that way.

Answer 3

ok ,can u help me

Answer 4

sure, but I will need and want your participation. I've given you several choices; I'm waiting for you to choose one of the actions I've suggested and to get started doing it.

Answer 5

subsitute the the possible answers

Answer 6

to make it easier you can divide the equation by 7

it then becomes

x^2 + 5x - 36 = 0

- you can solve this by factoring

Answer 7

ok

Answer 8

you 2 numbers whose product is -36 and whose sum is +5

Answer 9

ok

Answer 10

OK, @Twilliams250 : You have chosen to do this problem by substituting the given answers. In this case, why don't we start with x=4, substitute that value, and determine whether the given equation is true or false?

7x^2+35x-252=0 requires that we let x=4 in the first two terms.

We then get 7(4)^2 + 35(4) -252. Is that = to 0 or not equal to 0?

Answer 11

ok

Answer 12

equal

Answer 13

the question says select all corect answers

Answer 14

You could also use the approach suggested by cwrw238: to make it easier you can divide the equation by 7 and obtain 7[(4)^2+5(4)-36)=0, which is easier to evaluate. If you find that this equation is TRUE when x=4, then you have found one of the possible correct answers.

Just move on to the next given possible answer; substitute this value into

7(x^2+5x-36)=0 and determine whether this eq'n is true or false now.

And so on.

...

Answer 15

ok can u help me get all the correct answers

Answer 16

so 4 works