A = bh/2
A = 35, h = b + 3
35 = b(b+3)/2
70 = b^2 + 3b
b^2 + 3b - 70 = 0
- 7- = 10*(-7) and 10-7 = 3 = C
b^2 + 3b - 70 = (b+10)(b-7)
b+10 = 0, amd b-7 = 0
b = -10, the side can not be a negativ number, this is not the answer
b-7 = 0, b = 7 and h = 7 =3 = 10
A = 35 = 10*7/2
35 = 35
b = 7 and h = 10