Question

solve by using sutiable indenities
a) (x-3) (x+5)​

Answer 1

Step-by-step explanation:

Identity:      

An identity is an equality which is true for

all values of a variable in the equality.

(x + a) (x +b) = x²+(a + b) x +ab

In an identity the right hand side

expression is called expanded form of the

left hand side expression.

 

Solution:

$.$

(i) Using identity,

[(x + a) (x +b) = x² + (a + b) x +ab]

In (x -3) (x + 5),

 a = -3&

b = 5

Now,

(x -3) (x + 5),

= x² + (-3+ 5)x + (-3× 5)

= x² + 2x-15

Answer 2

Step-by-step explanation:

$\bf \: Question \: \:$

solve by using sutable indemnities

$\bf \: solution$

$\bf \: Find \: it \: \:$

$\bf (x-3) (x+5)$

$\bf (x-3) (x+5) \\ \bf \: {x}^{2} + 5x - 3x - 15 \\ \red{\bf \: {x}^{2} + 2x - 15}$