By using standard formulae, solve the following:
1.(x-7)(x+9)
2. (X + 2 y + 3)(x + 2 y + 7)
3. (2x + y + 5 )(2x + y - 9)
4.(x - 2y - 5) (x - 2y + 3)
5.(3x-4 y - 2) (3x -4 y - 6)
6.if a^2 + 4 a + x ={a + 2 }^2 find the value of x.
7.( 27)^3 + (-17)^3+(-10)^3
8. (-28)^3+(15)^3+(13)^3
Please tell the answers experts.. I ask many questions but no one tells the answer.Please clear all my doubts.

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