Question

For each of the following, use suitable identities to find the product:
1.(3a + b)(3a - b)
2.(4a² +8)(4a² - 8)
3.(3x² - 7)(3x²– 8) ​

Answer 1

Step-by-step explanation:

1) (3a+b)(3a-b)

=(3a)^2-(b)^2

=9a^2-b^2

2)(4a^2+8)(4a^2-8)

=(4a^2)^2-(8)^2

=16a^4-64

3)(3x^2-7)(3x^2-8)

=6x^4-24x^2-21x^2+56

=6x^4-45x^2+56