Question

ex 7 pls. daca se poate cat mai corect

Answer 1

I) (5+3)$x^{2}$=5$x^{2}$+3$x^{2}$+2x5x3
= 25+9+30
= 64
II) (5-3)$x^{2}$=5$x^{2}$-3$x^{2}$+2x5x3
=25-9+30
=46
III) (5-3)(5+3)=5$x^{2}$-3$x^{2}$
25+15-15-9=25-9
16=16