Question

please solve these two question .​

Answer 1

Answer:

4) a) (x+y)×9x²y=9x³y+9x²y²=9(1/2)³(-2)+9(1/2)²(-2)²

=-9/4 +9 =-9/4 +9×4/1×4=-9+36/4=27/4

b)x²y(6x-3x²)=6x³y-3x⁴y=6(1/2)³(-2)-3(1/2)⁴(-2)

=-3/2 +3/8 =-3×4/2×4 +3/8 =-12+3/8=-9/8

c)(x²+y²+2xy)(x²-2x³y³-5xy)=x²(x²-2x³y³-5xy)+y²(x²-2x³y³-5xy)+2xy(x²-2x³y³-5xy)

=x⁴-2x⁵y³-5x³y+x²y²-2x³y⁵-5xy³+2x³y-4x⁴y⁴-10x²y²

=x⁴-2x⁵y³-3x³y-9x²y²-2x³y⁵-5xy³

=(1/2)⁴-2(1/2)⁵(-2)³-3(1/2)³(-2)-9(1/2)²(-2)²-2(1/2)³(-2)⁵-5(1/2) (-2)³

=1/16 +1/2 +3/4 -9 +8 -5/2

=1/16 +1×8/2×8 +3×4/4×4 -9×16/1×16 +8×16/1×16 -5×8/2×8

=1/16+ 8/16 +12/16 -144/16 +128/16 -40/16

= -35/16

5) (0.02a²b²c-0.05ab²c)0.4abc

0.008a³b³c²-0.02a²b³c²

hope it helps you and don't forget to follow me