Question

pls answer me urgently please send me urgent ​

Answer 1

$i ) Let \: A = 12x + 7y-15z, \: and \: B =17x + 8y - 15z$

$B - A \\= 17x + 8y - 15z - ( 12x + 7y-15z)\\= 17x + 8y - 15z - 12x - 7y + 15z \\=17x - 12x + 8y - 7y -15z + 15z \\= ( 17 -12)x + (8-7)y + ( 15-15)z \\ = 5x + y$

$ii ) Let P = 16x^{3} + 14x^{2} - 9x + 15 \: and \\ Q = 17x^{3} - 19x^{2}+ 13x + 21$

/* According to the problem given */

$P - Q \\= 16x^{3} + 14x^{2} - 9x + 15 - (17x^{3} - 19x^{2}+ 13x + 21) \\= 16x^{3} + 14x^{2} - 9x + 15 - 17x^{3} + 19x^{2}- 13x - 21\\= 16x^{3} - 17x^{3} + 14x^{2} + 19x^{2} - 9x - 13x + 15 - 21 \\= (16-17)x^{3} + (14+19)x^{2} -(9+13)x - 6 \\= -x^{3} + 33x^{2} - 22x - 6$

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