Question

solve the equation by finding square roots
3x^2=21
but how do you do the work?

Answer 1

We need to get x by itself, what do you get when you divide both sides by 3?

Answer 2

7...then square root the 7 so its +or- the square root of 7??

Answer 3

yes, nice job!

Answer 4

thanks!

Answer 5

wanna help again? factor 4x^2+28x-32=0

Answer 6

if i may:

we can begin by factoring out a 4, giving us:

4(x^2+7x-8)=0
Now we have but to find two number that multiply to give us -8 and add to give us 7, we discern that those two numbers are -1 and 8, so the quadratic then factors to:
4(x-1)(x+8)=0
Now we set each term to 0:

4=0
x-1=0--->x=1
x+8=0--->x=-8

Answer 7

i get it thanks so much