Question

POLINÔMIOS:
a-) (3x²+7y²).(-x²+8x²y²+3y²)+(5x²+7x²y²-9y²)=
b-) (5x²+7x²y²-9y²)+(-x²+8x²y²+3y²)-(3x²+7y²)=

me ajudem!!!!

Answer 1

A) (+3x(+3x²+7y²).(-x²+8x²y²+3y²)+(5x²+7x²y²-9y²)=
(-3x⁴+24x⁴y²+9x²y²-7x²y²+56x²y⁴+21y⁴)+(5x²+7x²y²-9y²)=
-3x⁴+24x⁴y²+9x²y²-7x²y²+56x²y⁴+21y⁴+5x²+7x²y²-9y²=
-3x⁴+24x⁴y²+9x²y²+56x²y⁴+21y⁴-9y²=

B) (5x²+7x²y²-9y²)+(-x²+8x²y²+3y²)-(3x²+7y²)=
5x²+7x²y²-9y²-x²+8x²y²+3y²-3x²+7y²=
+x²+15x²y²+y²