Answer:
<u>sum</u><u> </u><u>is</u><u> </u><u>-</u><u>(</u><u>1</u><u>0</u><u>x</u><u> </u><u>+</u><u> </u><u>1</u><u>)</u>
Step-by-step explanation:

(x+y-3)(x+y+3) = x^2+xy+3x+xy+y^2+3y-3x-3y-9 = -9+x^2+y^2+2xy
Answer:
-36
Step-by-step explanation:
-9/2(10)+9
-90/2+9
-45+9
-36
Answer: a²= b²+c²
Step-by-step explanation:
Pythagorean theorem states the sum of the square of the other sides of Right angled triangle equals to the square of the longest side (hypotenus) of such triangle