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Slav-nsk [51]
3 years ago
9

Factor 3x 2 - 15x - 42. 3(x - 2)(x - 7) 3(x - 2)(x + 7) 3(x - 7)(x + 2)

Mathematics
2 answers:
Anna71 [15]3 years ago
7 0
3*(x-7)*(x+2)
last option
alexandr1967 [171]3 years ago
7 0
3x^2 - 15x - 42
3(x^2 - 5x - 14)
3(x - 7)(x + 2) <==
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Solve the quadratic equation<br> give your answer to 2 decimal places<br> : 3x^2+x-5=0
Dima020 [189]

Given:

The quadratic equation is:

3x^2+x-5=0

To find:

The solution for the given equation rounded to 2 decimal places.

Solution:

Quadratic formula: If a quadratic equation is ax^2+bx+c=0, then:

x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}

We have,

3x^2+x-5=0

Here, a=3,b=1,c=-5. Using the quadratic formula, we get

x=\dfrac{-1\pm \sqrt{1^2-4(3)(-5)}}{2(3)}

x=\dfrac{-1\pm \sqrt{1+60}}{6}

x=\dfrac{-1\pm \sqrt{61}}{6}

x=\dfrac{-1\pm 7.81025}{6}

Now,

x=\dfrac{-1+7.81025}{6}

x=1.13504167

x\approx 1.14

And

x=\dfrac{-1-7.81025}{6}

x=-1.468375

x\approx -1.47

Therefore, the required solutions are 1.14 and -1.47.

3 0
3 years ago
What is the value of the function at x = 3?
BARSIC [14]
The value is 3 because x=3 right there! it's not even a question, just an answer!
6 0
3 years ago
by which smallest number should the following number be multiplied to make the perfect square of 384​
solmaris [256]

The prime factorization of 384 = 2^7 * 3.

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6 0
2 years ago
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