Can someone please help me

6x^2 + 7x - 20

Step-by-step explanation:

First Terms: 2x * 3x = 6x^2

Out Side: 2x * -4 = -8x

Inside: 5*3x = 15x

Last:  5* - 4 = - 20

6x^2 - 8x + 15x - 20

6x^2 + 7x - 20

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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