Area = (base)*(height)
15 = (x+7)(x-7)
(x+7)(x-7) = 15
x^2 - 49 = 15
x^2 - 49+49 = 15+49
x^2 = 64
sqrt(x^2) = sqrt(64)
x = 8 ... note that x can't be negative
If x = 8, then the base is...
x+7 = 8+7 = 15
Therefore the base is 15 units.
(the height is x-7 = 8-7 = 1 unit)
You need to 8 + 4 = 12 and take the half of 12 and start at -4 and count up 6
6x+5-3y
Replace for x and y;
6(-2)+5-3(3)
=-12+5-9
=-12-9+5
=-21+5
=-16
