Which value of k makes
(2x + 3)(kx – 5) = 2kx^2 – x – 15 true?

A. –3

B. –1

C. 1

D. 3

Question

Which value of k makes 
(2x + 3)(kx – 5) = 2kx^2 – x – 15 true?

A. –3

B. –1

C. 1

D. 3

anonymous · Answer

Please anyone help!!! :(

johnweldon1993 · Answer

foil out those parenthesis

jim_thompson5910 · Answer

Hint:

(2x + 3)(kx – 5) = 2kx^2 – x – 15

2x(kx – 5) + 3(kx – 5) = 2kx^2 – x – 15

2kx^2 – 10x + 3kx – 15 = 2kx^2 – x – 15

-10x + 3kx – 15 = -x – 15

-10x + 3kx = -x

I'll let you finish.

anonymous · Answer

I have no idea how to finish it :(

jim_thompson5910 · Answer

you want to solve for k, so you need to isolate it

johnweldon1993 · Answer

well...we see that our x's can combine no?

-10x + 3kx = -x

combine the x's

add 10x to both sides and get

3kx = 9x

now can you solve for k?

anonymous · Answer

k is equal to three?

johnweldon1993 · Answer

very good :)

anonymous · Answer

THANK you so much :):):))))

johnweldon1993 · Answer

no problem...do you understand it?

anonymous · Answer

After you kind of simplifying it I understand your steps and how you came to finding k, but I wouldn't have a clue how to start if you didn't show how