Question

question-4 (iii) chapter name - Algebraic Expressions​

Answer 1

$(9x^{2} +8x-4)+(11-4x+3x^{2} )+(-3x+9-4x^{2} )$

$=x^{2} (9+3-4)+x(8-4-3)+(-4+11+9)$

$=8x^{2} +x+16$