Answer:
a² + b²
Step-by-step explanation:
(a + b)² - 2ab ← expand parenthesis using FOIL
= a² + 2ab + b² - 2ab ← collect like terms
= a² + b²
Answer:
7,515
Step-by-step explanation:
8/10= 0.8 tests per minute
Answer:
yellow: x=6
red: y=4
blue: y=-2
Step-by-step explanation:
X+x²=30
x²+x-30=0
(x+6)(x-5)=0
x=-6 or x=5