If you look at the quadratic formula:
x=(-b±√(b^2-4ac))/(2a)
We can say that -b=5, b=-5
If I read it right you had ±2√7 which is equal to ±√28, and we know b=-5 so:
±√(25-4ac)=±√28
And since 3=2a, a=1.5 making the above:
±√(25-6c)=±√28
25-6c=28
-6c=3
c=-0.5
So a=1.5, b=-5, and c=-0.5 thus
y=1.5x^2-5x-0.5
We can check this by reapplying the quadratic formula to the equation above
x=(5±√(25-4(1.5)(-0.5))/3
x=(5±√(25+3))/3
x=(5±√28)/3
x=(5±√(4*7))/3
x=(5±2√7)/3
Step 1: Simplify both sides of the equation.<span><span><span>x6</span>−5</span>=<span>−13</span></span><span>Simplify: (Show steps)</span><span><span><span><span>16</span>x</span>−5</span>=<span>−13</span></span>Step 2: Add 5 to both sides.<span><span><span><span><span>16</span>x</span>−5</span>+5</span>=<span><span>−13</span>+5</span></span><span><span><span>16</span>x</span>=<span>−8</span></span>Step 3: Multiply both sides by 6.<span>6*<span>(<span>16</span></span></span><span>x)</span>=<span><span>(6)</span>*<span>(<span>−8</span><span>)</span></span></span>x=<span>−<span>48
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Answer:
Jeff got 20 answers right.
Step-by-step explanation:
The maximum number of points Jeff can get is 100. (25 * 4) However, for each question he gets wrong, he's actually losing 6 points because he doesn't get the four points for getting right, and has the additional -2 points for getting it wrong. Since he only got a score of 70, that means he lost 30 points.
30/6 = 5. So he missed 5 question and got 20 question right.
<span>Brad has more apples since 10 > 5. </span>
Answer:
govenrs
Step-by-step explanation:
18yearolds
