(5x+1)² = 7; expand: 25x² + 10x +1 = 7 or 25x² + 10x -6 = 0
Solve this quadratic for x:
x = [-b + √(b² - 4ac)]/2a and x = [-b - √(b² - 4ac)]/2a
Plug the values and you'll find :
x = (- √7 - 1)/5 (answer C)
x = (+√7 -1)/5 (answer E)
D
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Answer:
see explanation
Step-by-step explanation:
The equation of 2 quantities in direct proportion is
y = kx ← k is the constant of proportionality
1
y = - 4x ← in standard form
with k = - 4
2
= 2 ( multiply both sides by x )
y = 2x ← in standard form
with k = 2
3
= 3 ( multiply both sides by y )
x = 3y ( divide both sides by 3 )
x = y ← in standard form
with k =
Answer:
Step-by-step explanation:
3:1 because she makes 3 times more baskets than John.
If a bowl of fruit contains 8 lemons and 6 oranges, then the ratio of oranges to lemons is eight to six or 8:6 which then can be reduced by to 4:3.
You reduce it by a common factor they share such as 2, because 2 x 4 = 8 and 2 x 3 = 6.
Hope that is the answer you seek.
