Question

dados os polinomios A=2x-5, B=4x+3 e C=3x²-10X-15, o valor de A . B+C ??

Answer 1

$\mathsf{(2x-5)(4x+3)=8x^{2}+6x-20x-15}\\\mathsf{(2x-5)(4x+3)=8x^{2}-14x-15}\\\mathsf{A.B=8x^{2}-14x-15}$

$\mathsf{A.B+C} \\\mathsf{ =8x^{2}-14x-15+3{x}^{2}-10x-15}\\\mathsf{A.B+C=11x^{2}-24x-30}$