Question

( 2 x+1=sqrt{15} )
Sanare ( rightarrow )
( 2 y quad 4 x^{2}+4 x=14 )
( 232 x^{2}+2 x=7 )
( 3 y quad 2 x^{2}+2 x-7=0 )
( begin{aligned} therefore 2 x^{3}+2 x^{2}-7 x &=0 therefore text { Vane of } 2 x^{3}+2 x^{2}-7 x+72 &=0+72 &=72 text { xhse } end{aligned} )

# (11) (iii) -1+ V15 Find the value of the expression 2x + 2x2 - 7x + 72 when x = -2 Solve the followin a tion 22 22 22

Solution