Question

Use suitable identities to expand the following
1.(3x+4)(3x+5)
2. (y-2)(y+4)
3. (4x-3y)(4x+3y)
4. (x^2/2+y/3)(x^2/2-y/3)
5. (2x+4y+6z)^2
6. (-a+b-x)^2
(3/2x+2y)^3
(5p-7q)^3​

Answer 1

Answer:

1. 9x²+15x+12x+20

9x²+27x+20

2. y²+4y-2y-8

y²-2y-8

3. (a-b) (a+b)= a²-b²

so, 8x²-9y²

5. (a+b+c)²= a ²+b² +c² +2ab+2bc+2ca

so, 4x²+16y²+36y²+16xy+48yz+24zx

6. using same identity,

(-a)²+b²+(-x)²+2(-a)(b)+2(b)(-x)+2(-x)(-a)

a²+b²+x²-2ab-2bx+2xa

8. (a-b)³= a³-b³-3ab(a-b)

so, 125p³-343q³-105pq(5p-7q)

125p³-343q³-525p²q+735pq²

Hope it's helpful to you dear.........✌️✌️✌️✌️ sry for .. question which I not answered.........