Question

$if \: \: x = 5 \: \: find \: \: the \: \: value \: \: of \: \: 6 - 7x {}^{2}$
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Answer 1

Answer:

>> Given:

Value of x :

= 5

>> To find:

The value of :

6 - 7x²

>> Concept:

First find the square of x .

Then multiply the square of x with the 7 and then subtract it with 6.

>> Solution:

$\Rightarrow{6-7x²}$

$\Rightarrow{6-7×(5)²}$

$\Rightarrow{6-7×(5×5)}$

$\Rightarrow{6-7×25}$

$\Rightarrow{6-175}$

$\Rightarrow{-169}$

>> Answer:

So , the value of 6-7x² is -169 .

>> Extra information:

Area of the square:

$As=S×S$

Where,

As = Area of the square

S = One side of the square

Area of the rectangle:

$Ar=L×B$

Where,

Ar = Area of the rectangle

L = Length

B = Breadth

Area of the triangle:

$At=\frac{H×B}{2}$

Where,

At = Area of the triangle

H = Height

B = Breadth

Answer 2

Answer:

$x = 5 \\ \\ 6 - 7 {x}^{2} = 6 - 7 \times {5}^{2} = 6 - 175 = -169$