Question

Add the polynomials 3x^3-2x^2+4x+5, x^3+x^2-3x-9???​

Answer 1

Solution:

$(3 ^{3} - 2x^{2} + 4x + 5) + (x {}^{3} + x ^{2} - 3x - 9)$

$= (3x ^{3} + x^{3} ) + ( - 2x {}^{2} + x ^{2} ) + (4x - 3x) + (5 - 9)$

$= (4x {}^{3} ) + ( - x {}^{2} ) + (x) + ( - 4)$

$= 4x {}^{3} - x ^{2} + x - 4(ans)$

Answer 2

Answer:

$\bf\underline{\underline{solution}}$

$( {3x}^{3} - {2x}^{2} + 4x + 5)( {x}^{3} + {x}^{2} - 3x - 9) \\ {3x}^{3} + {x}^{3} - {2x}^{2} + {x}^{2} + 4x - 3x + 5 - 9\\ {4x}^{3} - {x}^{2} + 4x - 4$