Question

Tentukan hasil pengurangan
a. 5x-9y dari 7x+15y
b. 5x-3y+7 dari 5y-3x-4
c. -x²+6xy+3y² dari 5x²-9xy-4y²

Answer 1

A. 7× + 15y - 5×- 9y
= (7× + 15y) - ( 5× - 9y)
= 7× + 15y - 5× -(9y)
= 7× + 15y - 5× + 9y
= 7× -5× + 15y + 9y
= 2× + 24y

b. 5y-3x-4 - 5× - 3y + 7
= (5y -3× -4) - (5× -3y +7)
=5y -3× -4 -5× -(-3y) +7
= 5y -3× -4 -5× + 3y + 7
= -3× -5× + 3y+5y -4+7
= -8× + 8y +3

c. 5x²-9xy-4y²-( -x²)+6xy+3y²
= (5 x²-9xy-4y²) - ( -x²+6xy+3y²)
= 5x²-9xy-4y² + x²+6xy+3y²
= 5x²+ x² -9xy + 6xy - 4y² + 3y²
=6 x²- 3xy- y²