exam Maths Puzzle Numerical Ability

Find the area between y = x3-81 x and the x-axis.

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exam Other Question

Could you please help me with solving this system of equation using multiplication? I get how to solve problems with addition anbd subtraction just not multiplication. Thanks
x+3y=-2
2x+y=6 2-i / 3-4i ,2-i/3-4i*3+4i/3+4i, 6+8i_3i_4i^2/15 ,10+5i/15 ,5(2+i)/5(3), 2/3 + 1/3i