Question

= (2x + y + 3x)[(20) + y + (33) - (20)(y) - ()(33) - (2x2
Su
= (2x) + y + (32) -
= (2r + y + 32) (4r + y +9= -2ry - 3y3 - 6x3)
EXERCISE 2.5
1.
Use suitable identities to find the following products
(1) (x + 4)(x + 10)
m) (x +81-10)
(m) (3x + 4) (-5)
3
3
(iv) lr +
(v) (3-201 (3+20)​

Answer 1

Answer:

(x + 4)(x + 10)

using identity

X+ a)(X+b)= x^2 + a+b x + ab

here, x= x

a= 4

b= 10

x^2 +( 4+10)x+ (4)(10)

x^2+ 14x+ 40

x+ 81-10

x+ 71

(3x + 4) (-5)

using binomial property of multiplication

(-5)(3x+ 4)

(-5)×3x+ (-5)×4

(-15x)+ (-20)

-15x-20

(3-201) (3+20)

(X+ a)(X+b)= x^2 + a+b x + ab

here, x= 3

a= (-201)

b= 20

(3) ^2+ (-201+20)3+ (-201)(20)

9+ (-181)3 - 4020

9- 383- 4020

9- 4403

4394