Hasil dari (2x-5)(x+4y-7)=beserta caranya..

(2x × x)= 2x²
(2x × 4y)=8xy
2x × (-7)=(-14x)
(-5 × x)=(-5x)
(-5 × 4y)=(-20y)
(-5 × -7)=35

=2x² +8xy – 14x – 5x – 20y + 35
=2x² – 19x + 8xy – 20y + 35
atau =2x² + 8xy – 19x +35(b)
semoga membantu