How do you solve 5xy plus 7xsquared - 12y when x equals 2 y equals 1?

Answer 1

In the given expression you replace x by 2 and y by 1.

Thus 5xy + 7x2 - 12y = 5*x*y + 7*x2 - 12*y

= 5*2*1 + 7*22 - 12*1 = 10 + 28 - 12 = 26