X² + 10x +2 = 0 .Complete the square of (x² + 10x + ??)
We know that (10x) is equal to twice the square root of the 1st (x) by ??
10x = 2.x.(??) and ?? = 5 and its square is 25. Then I have to add 25 and subtract 25 so that not to change the equation:
(x² + 10x + 25) -25 +2 =0
(x+5)² -23
12 *12 = 144
Therefore 12^2 = 144
Answer:
$22.84
Step-by-step explanation:
The tax is calculated by 0.075 * 21.25 = 1.59375 or $1.59. So the total bill is the cost of items purchased plus tax, which is $21.25 + $1.59 = $22.84.
4
x
+
y
−
2
z
=
0
4
x
+
y
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2
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=
0
,
2
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3
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3
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=
9
2
x
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3
y
+
3
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=
9
,
−
6
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2
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+
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0
-
6
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2
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0
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2
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4
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2
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4
,
2
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4
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8
2
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4
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8
3
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4
3
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4
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6
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7
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2
Answer:
2 1/4 cups
Step by step:
First we can set up a ratio (1:4). Then we can divide both by 4 to find how many cups of almonds per cup of trail mix. We get 0.25:1. Multiply both by 9, and there’s the answer (2.25:9).
Hope this helped <3
