its factoring quadratics
olume = length * height * width
Therefore 280 = 4 * (n + 2) * (n + 5)
Divide both sides of the equation by 4
70 = (n + 2)(n +5)
Expand
70 = n^2 + 5n + 2n + 10
Subtract 70 from both sides and simplify
0 = n^2 + 7n -60
Factor
(n +12)(n -5) = 0
Therefore n = -12 or + 5
As n cannot be less than -2 as you cannot have a negative dimension, it means that n = 5 and the sides are 4, (5 + 2), (5 + 5) = 4, 7 and 10 inches respectively
Volume is therefore
4*7*10 = 280 = correct
Hope this helped!
x + y
x - y
B) -
x - y
-x + y
C) -
x - y
-x - y
D) -
x + y
-x + y
B.(–5, 28)
C.(5, –28)
D.(5, 28)
Answer:
Option C is correct.
Solution to the given system of equation is (6 , -8)
Step-by-step explanation:
Given the system of equation:
......[1]
.....[2]
Substitute the equation [1] in [2] we get;
Combine like terms;
Add 10 to both side of an equation:
Simplify:
Divide both sides by we get;
Simplify:
x = 6
Substitute the value of x =6 in equation [1] we get;
or
Simplify:
y = - 8
therefore, the solution to the given system of equation is; (6 , -8)
You can also see in the graph as shown below: