c) 72 ÷ [(-3) × (-3)
]
Answers
Answered by
1
Answer:
Step-by-step explanation:
x
2
+1
=3
3
1
=>x+
x
1
=
3
10
Squaring both sides,
(x+
x
1
)
2
=(
3
10
)
2
=>x
2
+(
x
1
)
2
+2(x)(
x
1
)=
9
100
=>x
2
+(
x
1
)
2
=
9
100
−2
=>x
2
+(
x
1
)
2
=
9
82
Now, (x−
x
1
)
2
=x
2
+(
x
1
)
2
−2(x)(
x
1
)
=(
9
82
−2)
=(
9
64
)
(x−
x
1
)=
(
9
64
)
=(
3
8
)
=2
3
2
Answered by
0
Answer: 8
Step-by-step explanation:
72÷[(-3) × (-3)]
=72÷[-3×-3]
=72÷[9]
=72÷9
=8
∴the answer is 8
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