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3 years ago

15 - 1/2 x 2 equals 14, but i dont know the steps

1 answer:

3 0

Remember PEMDAS - parentheses, exponents, multiply, divide, add, subtract

because multiply come before subtract, your first step would be 1/2 x 2 = 1

next, you subtract -> 15 - 1 = 14

14 is your answer

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Evaluate 6+ the sq root of 14+x minus - the sq root of 9x when x=2

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Hello
let : f(x) = 6 + √(14+x) - <span>√(9x)
f(2) = </span>6 + √(14+2) - √(9×2)
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f(2) = 6 + 4 - √(18) = 10 - √(18)

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4 years ago

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3 years ago

Find all roots x^3 + 7x^2 + 12x = 0

babunello [35]

Answer:

Therefore the THREE roots are

$x=0\ or\ x=-3\ or x=-4$

Step-by-step explanation:

Given:

$x^{3}+7x^{2} +12x= 0$

To Find:

All the Roots = ?

Solution:

As the degree of the polynomial is THREE then the number of root are also THREE.

$x^{3}+7x^{2} +12x= 0\\\\x(x^{2}+7x +12)= 0\\\\x=0\\or\\x^{2}+7x +12= 0\\$

Now one root is Zero For other we need to Factorize

So by Splitting the middle term

i.e Factor of 12 such that sum should be 7

i.e 3 × 4 = 12 and 3 + 4 = 7

∴ $x^{2}+7x +12= 0\\x^{2}+3x+4x +12= 0\\x(x+3)+4(x+3)=0\\(x+3)(x+4)=0\\\\x+3=0\ or\ x+4 = 0\\\\\therefore x=-3\ or x=-4\ \textrm{Which are the roots}$

Therefore the THREE roots are

$x=0\ or\ x=-3\ or x=-4$

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3 years ago