Answer:
x^2 + 5n = 4mx
=> x^2 - 4mx + 5n = 0
D=0 (since one root then roots are equal)
b^2-4ac = 0
(-4m)^2 - 4(1)(5n) = 0
16m^2 - 20n = 0
16m^2 = 20n
8m^2 = 10n
4m^2 = 5n
hope it helps.......
Answer:
answer is C
Step-by-step explanation:
Answer:none of these.
Try to substitute any of the given values for x and the result is false
Step-by-step explanation:
Try x=1. 1-7 -6. Divide that by 1 and you get -6 = 6. False!
To solve the given equation, multiply sides by x to cancel the denominator. You get x-7 = 6x then subtract x from both sides to get -7=5x. Divide both sides by 5 to get x= -7/5
But if the original equation has an x^2 somewhere, there will be a different set of solutions.
Answer: the two trains will meet in 2.8 hours
Step-by-step explanation:
Step 1
Speed of train A = 90mph
Speed of train B = 110 mph
Since both trains are travelling towards each other
, their effective speed will be= 90 mph + 110mph= 200mph
Step 2
we know that Speed = distance / time
therefore Time = Distance / speed
Distance = 560 miles
Speed = 200 mph
Time = 560miles / 200mph
2.8 hours
Answer:
0.72
Step-by-step explanation:
1000ml in a litre. 12 x 60 ( minutes in an hour) = 720.
720/1000=0.72
