What is the product of a+3 and -2a2+15a+6b2?
O-2a3+9a2+45a+2462
O-2a3+21a2+45a+2462
O -2a3+9a2+45a+baba+1862
O-2a3+21a2+45a+6ab2+1862

-2a^3 + 9a^2 + 45a + 18b^2 + 6ab^2

Step-by-step explanation:

(a + 3) * (-2a^2 + 15a + 6b^2)

We open the brackets with (a + 3)

a ( -2a^2 + 15a + 6b^2) + 3(-2a^2 + 15a + 6b^2)

Opening the brackets

= a * -2a^2 = -2a^3

a * 15a = 15a^2

a * 6b^2 = 6ab^2

3 * -2a^2 = -6a^2

3 * 15a = 45a

3 * 6b^2 = 18b^2

Let's arrange those values weve gotten together ,don't forget the signs each carry

= -2a^3 + 15a^2 + 6ab^2 - 6a^2 + 45a + 18b^2

Collect the like terms

= -2a^3 + 15a^2 - 6a^2 + 6ab^2 + 45a + 18b^2

= -2a^3 + 9a^2 + 6ab^2 + 45a + 18b^2

gregory's graph is incorrect because it shows 2 inches of growth for each week when it should show 0.75 inches of growth each week.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)