(3a3 − 5b3) + _____ a3 + _____b3 = (a3 + b3).
1 answer:
3a^3-5b^3+xa^3+yb^3=1a^3+1b^3
replace a^3 with z
replace b^3 with v (to make it easier to see)
3z-5v+xz+yv=z+v
3z+xz+yv-5v=1z+v
the terms match them
3z+xz=1z
divide both sides by z
3+x=1
minus 3
x=-2
yv-5v=1v
dividie both sides by v
y-5=1
addd 5 to both sides
y=6
(3a^3-5b^3)+ <u>-2</u> a^3 +<u>6</u> b^3=(a^3+b^3)
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