Question

Simplify the expression x(2x-1) + 5 and its value at x = -2

Answer 1

When x= -2

Then,

x(2x-1)+5

-2(2(-2)-1)+5

-2(-4-1)+5

-2(-5)+5

+10+5

15

Answer 2

• On simplification the expression x(2x - 1) + 5 = 2x² - x + 5

• Value of the expression at x = - 2 is 15

Given :

The expression x(2x - 1) + 5

To find :

• Simplify the given expression

• Find value at x = - 2

Solution :

Step 1 of 3 :

Write down the given expression

The given expression is x(2x - 1) + 5

Step 2 of 3 :

Simplify the given expression

The given expression

= x(2x - 1) + 5

= 2x² - x + 5

Step 3 of 3 :

Find value at x = - 2

Value of the expression at x = - 2

$\sf = 2 \times {( - 2)}^{2} - ( - 2) + 5$

$\sf = 8 + 2 + 5$

$\sf = 15$

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