Question

if 5x - 2y = 10 and xy = -2 find the value of 25x² + 4y²​

Answer 1

Step-by-step explanation:

5x-2y=10

xy=-2

then find,25x2+4y2

(5x-2y)2 = (5x)2+(2y)2-2(5x)(2y)

(10)2=25x2+4y2-20(-2)

100=25x2+4y2+40

100-40=25x2+4y2

25x2+4y2=60