Question

Solve the equation and check for extraneous solutions. Click to see question!

Answer 1

\[\sqrt{7x+2}-2=7x\]

Answer 2

\[\sqrt{7x+2} = 7x + 2\]

Answer 3

so what must 7x+ 2 be?

Answer 4

Huuhh?

Answer 5

Is that the answer?

Answer 6

what number is square root of itself?

Answer 7

1 right?

Answer 8

I'm so bad at math and I have no idea what your talking about.

Answer 9

7x + 2 = 1
7x = -1
x = -1/7

Answer 10

Your sure that's right?

Answer 11

yea = try plugging in x = -1/7 in the original equation:
left hand side of equation:
sqrt ( 7 * -1/7 + 2) - 2 = sqrt(-1+2) - 2 = sqrt1 - 2 = -1
right hand side:
7*-1/7 + 2 = 1

- no thats not right

Answer 12

So what's the answer? haha.

Answer 13

Add 2 to both sides, square both sides, solve for x. Check your solutions in the original formula. One of them probably won't work

Answer 14

7x+2=(7x+2)^2
7x+2=49x^2+28x+4
49x^2+21x+2=0

Answer 15

Use quadratic formula, you'll get 2 answers. Check them both in the original equation and see which one works.

Answer 16

my concentration is poor today

Answer 17

49x^2+21x+2=0 SO this is the answer?

Answer 18

oh hold - -1/7 is a solution - i made a mistake when i checked it
rhs = -1

Answer 19

That's not the answer. Use the quadratic formula to get the answers from there.

Answer 20

Can you please just give me the answer I'm so bad at this and this is my last question!

Answer 21

yes -1/7 is correct

Answer 22

check back - i made a mistake
right hand side = 7 * -1/7 = -1

Answer 23

yes it works in original equation

Answer 24

Which one is the answer?!

Answer 25

-1/7 is correct

Answer 26

Yes, i double checked, there are 2 answers here...

Answer 27

-1/7 and -2/7 work, which you'd get from the quadratic formula