Question

IF X-Y=5 AND XY=84 FIND THE VALUE OF X²- Y²

Answer 1

Answer:

95

Step-by-step explanation:

(X+Y)^2 =  (X-Y)^2 + 4XY

(X+Y)^2 = (5)^2 + 4(84)

(X+Y)^2 = 25+336

(X+Y)^2 = 361

X+Y = 19

X²- Y² = (X+Y)(X-Y)

X²- Y² = 19*5 =95