Advertisements
Advertisements
प्रश्न
Solve of the following equations, giving answer up to two decimal places.
3x2 – x – 7 =0
Advertisements
उत्तर
3x2 – x – 7 =0
Here a = 3, b = −1 and c = −7
`x = (-b +- sqrt((-1)^2 - 4(3)(-7)))/(2(3))`
`=> x = (1 +- sqrt85)/6 = (1 +- 9.22)/6`
`=> x = 10.22/6 and (-8.22)/6 = 1.70 and -1.37`
संबंधित प्रश्न
Solve for x
`(2x)/(x-3)+1/(2x+3)+(3x+9)/((x-3)(2x+3)) = 0, x!=3,`
Solve the following quadratic equations by factorization:
`1/x-1/(x-2)=3` , x ≠ 0, 2
A plane left 40 minutes late due to bad weather and in order to reach its destination, 1600 km away in time, it had to increase its speed by 400 km/hr from its usual speed. Find the usual speed of the plane.
An aeroplane take 1 hour less for a journey of 1200 km if its speed is increased by 100 km/hr from its usual speed. Find its usual speed.
The sum of the squares of two consecutive positive even numbers is 452. Find the numbers.
If 2 is a root of the quadratic equation \[3 x^2 + px - 8 = 0\] and the quadratic equation \[4 x^2 - 2px + k = 0\] has equal roots, find the value of k.
In each of the following determine whether the given values are solutions of the equation or not.
x2 + `sqrt(2)` - 4 = 0; x = `sqrt(2)`, x = -2`sqrt(2)`
Solve the following equation by factorization
4x2 = 3x
Solve the following equation by factorization
`sqrt(3)x^2 + 10x + 7sqrt(3)` = 0
In an auditorium, the number of rows are equal to the number of seats in each row.If the number of rows is doubled and number of seats in each row is reduced by 5, then the total number of seats is increased by 375. How many rows were there?
