Question

B
Mathemati
19. Write in expanded form
OV
20. Write the expansion of the following
) (9x + 2y + 2)2 (ii) (3x - 2y – z12
Find the product of following
(0) (x + 3) (x2 – 3x + 9)
in 15a - 3) (25a2 + 15ab + 962
-​

Answer 1

Answer:

20 i.

$81 {x}^{2} + 4 {y}^{2} + 4$

ii.

$3 {x}^{2} - 4 {y}^{2} - {z}^{2}$

Answer 2

20. I.)Let (9x+2y+z)^2 be (a+b+c)^2

(a+b+c)^2 =a^2+b^2+c^2+2ab+2bc+2ac

=(9x+2y+z)^2

Your first answer is

=(9x)^2+(2y)^2+z^2+2(9x*2y)+2(2y*z)+2(9x*z)

20. ii) (3x-2y-z)^2 = (a-b-c)^2

(a-b-c)^2= a^2+b^2+c^2-2ab-2ac+2bc

=(3x-2y-z)^2

= (3x)^2+(2y)^2+z^2-2(3x*2y)-2(3x*z)+2(2y*z)

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