Question

Uprość wyrażenie
a) (-y - √7)2-(2x2-7y) (7y-2x2)
b) (xy2+3x) (-xy2+3x)- (3x)2

Answer 1

a) -2y - 2\sqrt{7} - (14x^{2}y - 4x^{4} - 49y^{2} + 14x^{2}y) =
= -2y - 2\sqrt{7} - 14x^{2}y + 4x^{4} + 49y^{2} - 14x^{2}y =

= -2y - 2\sqrt{7} - 28x^{2}y + 4x^{4} + 49y^{2}

 

b) x^{2}y^{4} + 3x^{2}y^{2} - 3x^{2}y^{2} + 9x^{2} -6x =

= x^{2}y^{4} + 9x^{2} - 6x