Q70 of 82 Page 4

Solve the following for x: (CBSE 2015)

⇒ (7x+1)(4x-1) = 29(x2 – 1)

⇒ 28x2 + 4x – 7x – 1 = 29x2 – 29

⇒ 28x2 -3x– 1 = 29x2 – 29

⇒ x2 + 3x – 28 = 0

⇒ x2 + 7x – 4x – 28 = 0

⇒ x( x + 7) – 4 (x + 7) = 0

⇒ (x – 4) ( x + 7) = 0

⇒ x = 4 or -7

More from this chapter

All 82 →
68

The numerator of a fraction is 3 less than the denominator. If 2 is added to both the numerator and the denominator, then the sum of the new fraction and the original fraction is , find the original fraction. (CBSE 2015)

 69

Solve the following for x: (CBSE 2015)

 71

Solve the following for x: (CBSE 2015)

 72

The area of an isosceles triangle is 60 cm2 and the length of each of its equal sides is13 cm. Find its base. (CBSE 2015)