Math (Elementary Algebra)
posted by Leah on .
What is the value of the expression 2x^2 + 3xy  4y^2 when x = 2 and y = 4 ?
Please help this is for my accuplacer. If you could show your work explaining how you got the answer that would be awesome. Thank you in advance

2x^2 + 3xy  4y^2
now substitute your values for every x and y:
2(2^2) + 3(2)(4)  4(4)^2
= 2(4)  24  4(16)
= 82464
= 80