Zad . 1 Zapisz w postaci sumy algebraicznej :
a) (5x -7y)²
b) (3a+5b)²
c) (2a-3)(2a+3)
d) (5a+4b)²
e) (2a-3b)²
f) (x²-3)²
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a)(5x-7y)(5x-7y)=5x^-35xy-35xy+49y^=5x^-70xy+49y^ ^ oznacza do potęgi 2
b)(3a+5b)(3a+5b)=9a^+15ab+15ab+25b^=9a^+30ab+25b^
c)4a^+6a-6a-9=4a^-9
d)(5a+4b)(5a+4b)=25a^+20ab+20ab+16b^=25a^+40ab+16b^
e)(2a-3b)(2a-3b)=4a^-6ab-6ab+9b^=4a^-12ab+9b^
f)(x^-3)(x^-3)=x^4-3x^-3x^+9=x^4-6x^+9 ^4 oznacza do potęgi 4