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Byju's Answer
Standard VIII
Mathematics
Multiplication of Binomial by a Binomial
Find the prod...
Question
Find the product of
(
x
+
7
y
)
(
7
x
−
y
)
.
A
7
x
2
+
48
x
y
−
7
y
2
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B
7
x
2
−
48
x
y
−
7
y
2
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C
7
x
2
+
48
x
y
+
7
y
2
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D
7
x
2
−
48
x
y
−
7
y
2
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Solution
The correct option is
A
7
x
2
+
48
x
y
−
7
y
2
(
x
+
7
y
)
(
7
x
−
y
)
=
x
(
7
x
−
y
)
+
7
y
×
(
7
x
−
y
)
=
7
x
2
−
x
y
+
49
x
y
−
7
y
2
=
7
x
2
+
48
x
y
−
7
y
2
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1
Similar questions
Q.
Find the product of
(
x
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.
Q.
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Q.
The equation of the ellipse with focus (-1,1), directrix x-y+3=0 and eccentricity 1/2 is
Q.
The equation of an ellipse with focus at
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Q.
The equation of the ellipse with focus (−1, 1), directrix x − y + 3 = 0 and eccentricity 1/2 is
(a) 7x
2
+ 2xy + 7y
2
+ 10x + 10y + 7 = 0
(b) 7x
2
+ 2xy + 7y
2
+ 10x − 10y + 7 = 0
(c) 7x
2
+ 2xy + 7y
2
+ 10x − 10y − 7 = 0
(d) none of these