Question

De la suma de x2-6y2 con -7xy+40y2 restar -9y2+16

Answer 1

$x^{2} -6y^{2} + (-7xy+40y^{2} )$

$x^{2} -6y^{2} -7xy+40y^{2}$

$x^{2}-7xy+34y^{2}$

$x^{2}-7xy+34y^{2}-(-9y^{2}+16) x^{2}-7xy+34y^{2}+9y^{2}-16 x^{2}+43y^{2}-7xy-16$