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Byju's Answer
Standard VIII
Mathematics
Factorisation by Regrouping Terms
Factorise: ...
Question
Factorise:
x
2
+
18
x
+
45
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Solution
x
2
+
18
x
+
45
=
x
2
+
15
x
+
3
x
+
45
=
x
(
x
+
15
)
+
3
(
x
+
15
)
=
(
x
+
15
)
(
x
+
3
)
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Q.
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Q.
The equation of the parabola whose focus is (1, −1) and the directrix is x + y + 7 = 0 is
(a) x
2
+ y
2
− 2xy − 18x − 10y = 0
(b) x
2
− 18x − 10y − 45 = 0
(c) x
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(d) x
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+ y
2
− 2xy − 18x − 10y − 45 = 0
