Answer:
20cm^2
Step-by-step explanation:
0.5x(7+3)x4=20cm^2
Answer:
-3
Step-by-step explanation:
I just took the test and the answer is
(x-3)^2 + (x+5)^2=9^2
(x^2-6x+9) + (x^2+10x+25)=81
2x^2+4x+34=81
2x^2+4x-47=0
From here just use quadratic formula
