Step-by-step explanation:
3x^2+3x+76=4x^2+3x-24
0=x^2+-100
x=10 or -10 (rejected)
x=10
Side
3x^2+3x+76 = 3(100)+3(10)+76 = 406
Area:
406^2=164836
perimeter:
4(406)=1624
