kidyugey
08.11.2019 •
Mathematics
Determine the standard form of an equation that passes through (2,2) and (-6,4).
a) x+4y=10
b) y=-1/4x+5/2
c) -x+y=5/2
d) 2x+2y=-24
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Ответ:
y = mx + b
2 = -1/4(2) + b
2 = -1/2 + b
b = 5/2
equation
y = -1/4x + 5/2
4y = -x + 10
x + 4y = 10
answer
A) x+4y=10
Ответ:
n = sqrt(7) - 5 or n = -5 - sqrt(7)
Step-by-step explanation:
Solve for n:
(n^2 + 10 n + 18)/(n + 5) = 0
Multiply both sides by n + 5:
n^2 + 10 n + 18 = 0
Subtract 18 from both sides:
n^2 + 10 n = -18
Add 25 to both sides:
n^2 + 10 n + 25 = 7
Write the left hand side as a square:
(n + 5)^2 = 7
Take the square root of both sides:
n + 5 = sqrt(7) or n + 5 = -sqrt(7)
Subtract 5 from both sides:
n = sqrt(7) - 5 or n + 5 = -sqrt(7)
Subtract 5 from both sides:
n = sqrt(7) - 5 or n = -5 - sqrt(7)