Question

plz give this answer and get 20 points if you know then give answer with explainisation

Answer 1

Answer:

of which problem you want solution of?

17 18 or 19 or all may it help you

Answer 2

Answer:1. 1

2. 1

3. 2a^2+3b^2+c^2-12ab+6bc+4ac

Step-by-step explanation: 1. x+1 / x = 11

x+1=11x

10x=1

x=1/10

x^2=1/100

1/x^2=100

x^2+1/x^2 = 100*1/100 =1

2. from (a+b)^2=a^2+b^2+2ab,

(3x+5y)^2=9x^2+25y^2+2*3x*5y

(3x+5y)^2=181-180

3x+5y=1

3. (2a-3b-c)=2a^2+3b^2+c^2+(2*2a*-3)+(2*-3b*-c)+(2*2a*-c)

=2a^2+3b^2+c^2-12ab+6bc+4ac