Question

1. Find the value of the expression 3x+5 (x-2) for X=2

2. Find the value of the expression x²+2x+1 for X=1​

Answer 1

Answer:

Ans. 1) 6

Ans. 2) 0

Step-by-step explanation:

Solution :

Answer 1)

$\sf{Solution\:of\:3x + 5(x - 2)\:for\:x = 2}$

Substitute the value of x in the given expression:

$\sf\longrightarrow \: {3x + 5(x - 2)}$

$\sf\longrightarrow \:3(2)+ 5(2 - 2)$

$\sf\longrightarrow \:6 + 5(0)$

$\sf\longrightarrow \:6 + 0$

$\sf\longrightarrow \:6$

Therefore, the solution of $\sf{3x + 5(x - 2)}$ for $\sf{x = 2}$ is 6.

____________________________

Answer 2)

$\sf{Solution\:of\:x^{2} + 2x +1\:for\:x = (-1)}$

Substitute the value of x in the given expression:

$\sf{\longrightarrow} \: x^{2} + 2x + 1$

$\sf{\longrightarrow} \: {( - 1)}^{2} + 2( -1 ) + 1$

$\sf{\longrightarrow} \: 1 - 2 + 1$

$\sf{\longrightarrow} \: - 1 - 1$

$\sf{\longrightarrow} \: 0$

Therefore, the solution of $\sf{x^{2} + 2x +1}$ for $\sf{x =(-1)}$ is 0.

Answer 2

Answer:

The expression (−3x

2

+5x−2)−2(x

2

−2x−1)

=−3x

2

+5x−2−2x

2

+4x+2

=−5x

2

+9x

Comparing with ax

2

+bx+c, we get

a=−5,b=9