Question

pls help simple stuff
If xy = 4, which is equivalent to y(x-4)(x+2)
1) x^2 -2x + 8
2) 4x - 8 - 8y
3) 5x
4) 5

Answer 1

Answer: 2) 4x - 8 - 8y

Step-by-step explanation:

if xy=4

then y(x-4)(x+2)                                use foil method with parenthisies to get

y(x²+2x-4x-8)                                  foil again

x²y+2xy-4xy-8y                               plug 4 in for xy

x²y+2(4)-4(4)-8y                               solve what u can

x²y+8-16-8y= x²y-8-8y            

for x²y if you take out the exponent you have an xy and an x so when u plug in 4 you get 4x ending up with a solution of

4x-8-8y

Hope that helped