Question

Find the value of 5x²-3x+7 when x is equal to ½​

Answer 1

Answer:

answer is 27/4 the value is 27/4

Answer 2

Answer:

Given :

$\sf{{5x}^{2}-3x+7}$

$\sf{Value\:of\:x=\dfrac{1}{2}}$

To find :

The value of the equation

Concept :

Multiply the number with the value of x .

And use the BODMAS formula .

B = Brackets

O = Of

D = Division

M = Multiplication

A = Addtion

S = Subtraction

Solution :

$\sf:\implies{{5x}^{2}-3x+7}$

$\sf:\implies{{5\times\dfrac{1}{2}}^{2}-3\times\dfrac{1}{2}+7}$

First find the square

$\sf:\implies{5\times(\dfrac{1}{2}\times\dfrac{1}{2})-\dfrac{3}{2}+7}$

$\sf:\implies{5\times\dfrac{1}{4}-\dfrac{3}{2}+7}$

$\sf:\implies{\dfrac{5}{4}-\dfrac{3}{2}+7}$

Now , first add the + integer with the + integer . After adding subtract it with the - integer .

$\sf:\implies{(\dfrac{5}{4}+\dfrac{7}{1})-\dfrac{3}{2}}$

L.C.M of 4 and 1 is 4 .

$\sf:\implies{(\dfrac{5+28}{4})-\dfrac{3}{2}}$

$\sf:\implies{\dfrac{33}{4}-\dfrac{3}{2}}$

L.C.M of 2 and 4 is 4 .

$\sf:\implies{\dfrac{33-6}{4}}$

$\sf:\implies{\dfrac{27}{4}}$

Now make it in the mixed fraction .

$\sf:\implies{6\dfrac{3}{4}}$

Answer :

So , the value of the equation is $\sf{6\dfrac{3}{4}}$