The shores of the Dead Sea between Israel and Jordan, are 1312 feet below sea level. If you use the number 1312 to represent 1312 above sea level,
what number could be used to represent 1312 feet below sea level?

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hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb