Question

If x=(√3+1)/2 , find the value of 4x3 + 2x2 – 8x + 7.

plz tell the steps answer is 10. ​

Answer 1

Answer:

yes it is 10

Step-by-step explanation:

(a+b)^3=(a^3+3*a^2*b+3*a*b^2+b^3)

(a+b)^2=(a^2+2*a*b+b^2)

4(√3+1/2)^3+2(√3+1/2)^2-8(√3+1/2)+7

4((3√3+9+3√3+1))/8+2((3+2√3+1))/4-8((√3+1))/2+7

(8√3+14)/2-(8√3-8)/2+7

=10