Question

Solve the equation by completing the square.
4x^2-40x-12=0

Answer 1

What's the first step to completing the square ?

Answer 2

First divide the coefficient of x and square it..

Answer 3

oh ok that makes sense

Answer 4

but wait what are we dividing the coefficient of x by?

Answer 5

We divide it by 2..

Answer 6

oh

Answer 7

After squaring it add it to the equation..

Answer 8

ok...

Answer 9

To equal it to zero add a negative value also...

Answer 10

i see

Answer 11

40x^2-40x-12=0
divide both sides by 4 to simplify.
10x^2-10x-3=0

Answer 12

Yeah I forgot... @mayankdevnani has written a missing step.. :D

Answer 13

yaa

Answer 14

oh simplifying it first... got it!

Answer 15

Then the equation would be like this..
\[x^2-10x+25-28=0\]Solve this...

Answer 16

am i doing the right thing so far? ... sorry