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3 years ago

Evaluate 3x^2 – 4 when x = 2.

Mathematics

2 answers:

polet [3.4K]3 years ago

7 0

Answer:

C ) 8.

Step-by-step explanation:

Given: 3x^2 – 4 when x = 2.

To find: Evaluate.

Solution: We have given that 3x²– 4

For x =2.

3(2)²– 4.

On solving the power of 2.

3 (4) - 4.

12 - 4 .

On subtracting 4 form 12

Therefore, C ) 8.

Mashcka [7]3 years ago

3 0

When x = 2
3x^2 = 3*4 = 12
12-4 = 8
C. is the answer

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Ratling [72]

X method is the method to find the factors of the polynomial equation.The factor of the given polynomial is,

$x^2+16x-3x-48=(x+16)(x-3)$

Thus the option 3 is the correct option,

<h3>How to find factor of polynomial using X method?</h3>

X method is the method to find the factors of the polynomial equation.

The standard form of the quadratic equitation is given as,

$ax^2+bx+c$

Given information-

The equation given in the problem is,

$x^2+13x-48$

Compare the above equation with the standard form. We get,

$a=1\\b=13\\c=-48$

To find out the factor of above equation using X method, follow the steps.

Step 1) Multiply $a$ and $c$ and place $ac$ at the top of X as shown in the image.

$ac=1\times(-48)\\ac=-48$

Step 2) Place $b$ at the bottom as shown in the image below.

$b=13$

Step 3) Find two numbers that multiply the top number $ac$ and to the bottom number $b$ .

Step 4) Write the polynomial from the X box as,

$x^2+16x-3x-48=x(x+16)-3(x+16)$

$x^2+16x-3x-48=(x+16)(x-3)$

Hence the factor of the given polynomial is,

$x^2+16x-3x-48=(x+16)(x-3)$

Thus the option 3 is the correct option,

Learn more about the X method here;

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8 0

3 years ago

Read 2 more answers