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?

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?

anonymous · Answer

did you try expanding it and factoring it?

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

what happened to GEMDAS

anonymous · Answer

grouping first i thought

anonymous · Answer

just think it like this.. if you get the square root of both sides: |dw:1383170594546:dw|