Question

please answer.......I will mark as brainliest..​

Answer 1

1.) =5z( z- x -y) - {4y(y- z+ x) - 3x(x-y+z)}

=Expand all the brackets by multiplying

=5z2 - 5xz-5yz - (4y2 -4zy + 4xy - 3x2 + 3xy-3xz)

=5z2 - 5xz - 5yz -4y2+4zy - 4xy+ 3x2 -3xy + 3xz

=5z2 - 4y2 + 3x2 - 5xz +3xz - 5yz +4zy - 4xy-3xy

=5z2 - 4y2 + 3x2 - 2xz -zy-7xy

2.) SUM OF 3xy-2x2 + 19 + 9y2 +3x2 - 5

=3xy - 2x2 + 3x2 +9y2 +19-5

=3xy+x2 +9y2 +14

SUBTRACT 3xy+x2 +9y2 +14 -(-5)

=3xy +x2 +9y2 +14 +5

=3xy+x2 +9y2 +19

HOPE IT HELPS.

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