add and subtract
Xy+7-2,xy+5
Answers
Answered by
1
Answer:
Add
(xy+7-2) + (xy+5)
→ xy +7-2 + xy +5
→ xy +xy +7-2+5
→ 2xy +10
is your answer
Hope it will surely help you
Answered by
1
Step-by-step explanation:
Equation 1 : x+y=7x+y=7
Equation 2 : xy = \frac{5}{2}xy=
2
5
Identity: {(x + y)}^{2} = {x}^{2} + {y}^{2} + 2xy(x+y)
2
=x
2
+y
2
+2xy
\frac{49}{4} = {x}^{2} + {y}^{2} + 5
4
49
=x
2
+y
2
+5
{x}^{2} + {y}^{2} = \frac{29}{4}x
2
+y
2
=
4
29
{(x - y)}^{2} = \frac{29}{4} - 5 = \frac{9}{4}(x−y)
2
=
4
29
−5=
4
9
x - y = \frac{3}{2}x−y=
2
3
{x}^{2} - {y }^{2} = \frac{7}{2 } \times \frac{3}{2} = \frac{21}{4}x
2
−y
2
=
2
7
×
2
3
=
4
21
Hence The value of x-y is 3/2 andx^2 -y^2 = \frac{21}{4}x
2
−y
2
=
4
21
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