Question

3, 5, 6, 10, 11 and 12 answer please

Answer 1

11)

here x+1 is the biggest side lie infront of 90 degree angle

(x+1)^2 = x^2 +(x-1)^2

x^2+2x+1=x^2+x^2-2x+1

4x=x^2

x^2-4x=0

take x as common

x(x-4)=0

x=0 or x=4