Question

(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

JEE/Engineering Exams

Maths

Solution

154

4.0 (1 ratings)

( 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} )