Answer:
10
Step-by-step explanation:
3x + 5y
Let x= -5 and y =5
3(-5) + 5(5)
Multiply first
-15 +25
Then add
10
Answer:
x = 18
Step-by-step explanation:
y = x + 8
2x + y = -10
Add 10 to 8, then subtract x from 2x leaving you with one x, and finally subtract y from y leaving you with X = 18
Answer:
2x³ + 17x² + 41x + 30 = (x + 5) (x + 2) (2x + 3)
Step-by-step explanation:
2x³ + 17x² + 41x + 30 = (x + 5) (2x² + ax + 6) =
2x³ + (a + 10) x² + (5a + 6) x + 30
a + 10 = 17 a = 7 ( check: 5a + 6 = 5 x 7 + 6 = 41)
2x³ + 17x² + 41x + 30 = (x + 5) (2x² + 7x + 6) = (x + 5) (x + 2) (2x + 3)