Question DEF will be reflected across a line such that all of vertices of triangle D’E’F are in quadrant II. What line of reflection is used to form triangle D’E’F’? The line of reflection is
A. y = 0
B. x = 0
C. y = x
D. y = -x

step-by-step explanation:

unless if u could do my questions, if not i wouldn't want to

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

for the free

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