Question

if x+y=14 and x-y=4, the x²+y²-xy=____​

Answer 1

Step-by-step explanation:

x+y=14------> equation 1

x-y=4--->equation 2

solve equation 1 and 2

x+y=14

x-y=4

2x=10

x=10/2

x=5

substitute in equation 1

x+y=14

5+y=14

y=14-5

y=9

x=5,y=9

x²+y²-xy=5²+9²-5×9

=25+81-45

=61

x²+y²-xy=61

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