Question

What is the value of k?
3x + 7 = x2 + k = 7x + 15

Answer 1

too many equal signs?

Answer 2

That's the problem my teacher gave me.. ?

Answer 3

okay, we can take the first and last equations

3x + 7 = 7x + 15

solve for x

x = -2

and use this to solve for k

Answer 4

Totally sure.

Answer 5

Note

7x + 15 = 7(-2) + 15 = 1

Therefore

1 = x^2 + k

or

1 = 4 + k

so

k = -3

QED

Answer 6

3(-2)+7=(-2)^2+(-3)=7(-2)+15
1=1=1
fine maybe it is true lol

Answer 7

Neat Question!

Answer 8

Lol, thanks guys. ^_^