Question

(2x + 3) (4x² - 6x + 9)

tell me question no. 2,4,5,7​

Answer 1

Step-by-step explanation:

2. (2x+3) (4x^2-6x+9)

= 2x(4x^2-6x+9) +3(4x^2-6x+9)

= 8x^3-12x^2+18x +12x^2-18x+27

= 8x^3+18x-18x+27

=8x^3+27

4. (3x+4y) (9x^2-12xy+16y^2)

= 3x(9x^2-12xy+16y^2) +4y(9x^2-12xy+16y^2)

= 27x^3-36x^2y+48xy^2 +36yx^2-48xy^2+64y^3

= 27x^3+64y^3-36x^2y+36yx^2 +48xy^2+48xy^2

= 27x^3+64y^3

5. (4xy-1) (16x^2y^2+4xy+1)

= 4xy(16x^2y^2+4xy+1) -1(16x^2y^2+4xy+1)

= 64x^3y^3+16x^2y^2+4xy -16x^2y^2 - 4xy-1

= 64x^3y^3-1

7. (2x^2-1) (4x^4+2x^2+1)

= 2x^2(4x^4+2x^2+1) -1 (4x^4+2x^2+1)

= 8x^6+ 4x^4+2x^2-4x^4-2x^2-1

= 8x^6-1

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