10.
Get x by itself
x^2 = 16 (divide by 3 after moving 48 to other side)
Square root
x = 4, -4
11.
Once again get x by itself
x^2 = 4 (divide by 4 after moving 10 to the other side)
Square root
x = 2, -2
12. To find this we will model the equation like so
2W x W = 72
W is the width
2w is the length because it is twice the width
simply
w^2 = 36
square root
width is 6 and the length is 12
13.
To find the solutions we must factor the equation
(x+5)(x-2) satsify the equation
Then solve for x X + 5 = 0 and X - 2 = 0
x = -5, 2