Question

find the products using suitable identities:
a)(x+8)(x-10)
b)(3-2x)(3+2x)
​

Answer 1

Step-by-step explanation:

a)

$(x + 8) \times (x - 10)$

$x \times (x - 10) + 8 \times (x - 10)$

$x {}^{2} - 10x + 8x - 80$

$= \: x {}^{2} - 2x - 80$ ans

b)

$(3 - 2x) \times (3 + 2x)$

$3 \times (3 + 2x) - 2x \times (3 + 2x)$

$9 + 6x - 6x - 4x {}^{2}$

$= \: 9 - 4x {}^{2}$ ans

Answer 2

Answer:

a)x^2-2x-80

b)9-4x^2

Step-by-step explanation:

(x+8)(x-10)=(x^2+8x-10x-80)=x^2-2x-80

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