Question

X^2 -3x -10=0 in completing square method class 10

Answer 1

Answer:

x^2-5x+2x-10=0

x(x-5)+2(x-5)=0

(x+2)(x-5)=0

x+2=0 or x-5=0

x=-2 or x=5

Answer 2

Answer:

x^2-3x-10=0

a=1

b=-3

c=-10

solving the steps by the quadratic formula

D= b^2- 4ac

D=(-3)^2-4×1×-10

D= 9+40

D= 49

second formula

X = -b +-under root 49

______________

2a

X =-(-3) +- 7

_____

2×1

x= 3+ 7

___

2

×= 10

_

2

x= 5

second

x= 3-7

__

2

x= -4

__

2

X= -2