Question

if x+y=7 and x-y=3,evaluate find xy​

Answer 1

Answer:

0 (ZERO)

Step-by-step explanation:

x+y=7

x-y=7

____

2x=14

x= 7

7+y=7

y=0

xy = 7 × 0 = 0

Answer 2

Step-by-step explanation:

$x + y = 7 \\ x - y = 3 \\ xy = \frac{4xy}{4} \\ = \frac{ {(x + y)}^{2} - {(x - y)}^{2} }{4} \\ = \frac{ {7}^{2} - {3}^{2} }{4} \\ = \frac{49 - 9}{4} \\ = \frac{40}{4} \\ = 10$

here's the answer

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