Question

Find the sum of \left(7x^3-3x^2\right)(7x

3
−3x
2
) and \left(2x^3-5x^2\right)(2x
3
−5x
2
)


9x^3-8x^29x
3
−8x
2


5x^35x
3


9x^3+2x9x
3
+2x

5x^3-8x^25x
3
−8x
2

Answer 1

\left(7x^3-3x^2\right)(7x3−3x2) =15x\left(7x^3-3x^2\right)

\left(2x^3-5x^2\right)(2x3−5x2)9x^3 8x^29x3−8x25x^35x39x^3+2x9x3+2x5x^3-8x^25x3−8x2 =-39000x^8-72x^7+180x^6+10x^4-336x^3+54x^2-16x