(2x+3y)^2 = 4 expand
4x^2 + 12 xy + 9y^2 = 4
4 x^2 + 12(-5) + 9y^2 = 4 You can take it from here, hopefully !
well i got that already i got 4x + 9y = 64 but i dont understand how to turn this into 4x^2 + 9y^2 = something?
Well, if you got 4x + 9y = 64 you didn't look at the answer I gave you......
Ok i got it right thank you! i understood my mistake was i forgot that when simplifying (2x+3y)(2x+3y) i just multiplyed out the integers but i forgot that the variables also square each other.