Question

efetue : a)(4x²+5x-3)+(-2x+3) = b)(2a³+3a²+5)-(2a³-5a²-6)= gabarito

Answer 1

4x² + 5x - 3 - 2x + 3  =
4x² + 2x  = 
2x ( 2x + 1 )****

b
2a³  + 3a² + 5 - 2a³ + 5a² + 6 =
8a² + 11 ****

Answer 2

Olá.

$\mathsf{A}\\\mathsf{(4x^2+5x-3)+(-2x+3)=4x^2+5x-3+-2x+3=}\\\mathsf{4x^2+3x}\\\\\mathsf{Simplificando...}\\\\\boxed{\mathsf{x(4x+3)}}\\\\\\\\\mathsf{B}\\\mathsf{(2a^3+3a^2+5)-(2a^3-5a^2-6)=2a^3+3a^2+5-2a^3+5a^2+6}\\\mathsf{8a^2+11}\\\\\mathsf{a^2=\dfrac{11}{9}}\\\\\boxed{\mathsf{a=\sqrt{\dfrac{11}{99}}}}$

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Bons estudos.