Advertisements
Advertisements
प्रश्न
Find the value of x, if a + 1 = 0 and x2 + ax – 6 = 0.
उत्तर
If a + 1 = 0, then a = –1
Put this value in the given equation x2 + ax – 6 = 0
x2 – x – 6 = 0
⇒ x2 – 3x + 2x – 6 = 0
⇒ x(x – 3) + 2(x – 3) = 0
⇒ (x – 3)(x + 2) = 0
If x – 3 = 0 or x + 2 = 0
Then x = 3 or x = –2
APPEARS IN
संबंधित प्रश्न
Check whether the following is the quadratic equation:
x3 - 4x2 - x + 1 = (x - 2)3
A train travels at a certain average speed for a distance of 63 km and then travels at a distance of 72 km at an average speed of 6 km/hr more than its original speed. If it takes 3 hours to complete the total journey, what is the original average speed?
Check whether the following is quadratic equation or not.
`2x^2-sqrt(3x)+9=0`
Without solving, comment upon the nature of roots of the following equation:
2x2 + 8x + 9 = 0
Which of the following are quadratic equation in x?
`x^2-3x-sqrtx+4=0`
`x^2+6x+5=0`
Solve:
`(1200/x + 2)(x - 10) - 1200 = 60`
Solve the following quadratic equation by using formula method :
7y2 - 5y - 2 = 0
Solve the following equation by using formula :
`(x + 1)/(x + 3) = (3x + 2)/(2x + 3)`
From the following equations, which one is the quadratic equation?
