Question

Solve the quadratic equation by isolating the perfect square.
2(x+4)^2-2=34
I got x=-1 but my teacher marked that wrong?

Answer 1

did you try expanding it and factoring it?

Answer 2

I added 2 to both side. 2(x+4)^2 = 36
I then square rooted both sides. 2(x+4) = 6
I divided by two. x+4=3
I subtracted 4. x=-1

Answer 3

you should divide both sides by two first before you get the square root
if you get the square root of a number it should be positive or negative

Answer 4

what happened to GEMDAS

Answer 5

grouping first i thought

Answer 6

just think it like this.. if you get the square root of both sides: