Question

extra problems on quadratic equation ....please guys I want with answers ​

Answer 1

Answer:

ok

Step-by-step explanation:

first follow me you will get it i will give i extra problems

Answer 2

Answer:

Question 1.

Find the roots of the equation x2 – 3x – m (m + 3) = 0, where m is a constant. (2011OD)

Solution:

x2 – 3x – m(m + 3) = 0

D = b2 – 4ac

D = (- 3)2 – 4(1) [-m(m + 3)]

= 9 + 4m (m + 3)

= 4m2 + 12m + 9 = (2m + 3)2

Important Questions for Class 10 Maths Chapter 4 Quadratic Equations 1

∴ x = m + 3 or -m

Question 2.

If 1 is a root of the equations ay2 + ay + 3 = 0 and y2 + y + b = 0, then find the value of ab. (2012D)

Solution:

ay2 + ay + 3 = 0

a(1)2 + a(1) + 3 = 0

2a = -3

a = −3/2

y2 + y + b = 0

12 + 1 + b = 0

b = -2

∴ ab =(−32)(−2) = 3

Question 3.

If x = – 12 , is a solution of the quadratic equation 3x2 + 2kx – 3 = 0, find the value of k. (2015D)

Solution:

The given quadratic equation can be written as, 3x2 + 2kx – 3 = 0

Important Questions for Class 10 Maths Chapter 4 Quadratic Equations 2