What two facts can you double to find 8 x 4

The answer is 2 and 8

Step-by-step explanation:

First let us find the value of 8*4

8*4 = 32

Second let us find two numbers that we can correctly multiply to give half of 32 I.e 16.. Say 8 and 2

Hence 8*2=16

So that when we double 16 we have 32

I.e

16*2=32

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

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

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb