Question

Q6
Calculate the value of the following algebraic expression:
3x2 + (x - 1)(x + 1) + 3(x + 2) + 5 at x = -1.​

Answer 1

Answer: 11

Step-by-step explanation:

• To calculate the value of expression $3x^{2}+(x-1)(x+1)+3(x+2)+5$ at x=(-1).
• $3x^{2}+(x-1)(x+1)+3(x+2)+5$

     ⇒$3(-1)^{2}+(x^{2} -1)+3(-1+2)+5$

     ⇒$3(1)+[(-1)^{2} -1]+3(1)+5$

     ⇒3+[1-1]+3+5

     ⇒3+0+3+5

    ⇒ 11

• Hence, the value of given expression at x=(-1 ) is 11.