Respuesta :

JadeMatildeF

Answer: y^2-y-12

Step-by-step explanation:

a=y, b=3, c=y, d=-4

=yy+y\left(-4\right)+3y+3\left(-4\right)

Apply minus−plus rules

(+(−a)​=−a)

=yy-4y+3y-3\cdot \:4

Simplify yy-4y+3y-3x4:y^2-y-12

=y^2-y-12