Question

плмогите с заданием 31.3

Answer 1

1) a²-49=(a-7)(a+7)

2) 64-b²=(8+b)(8-b)

3) c²-2,25=(c+1,5)(c-1,5)

4) 2,89-d²=(1,7+d)(1,7-d)

5) $frac{64}{81} -x^{2} = (frac{8}{9} +x)(frac{8}{9} -x)$

6) $frac{100}{121} - y^{2} =(frac{10}{11} +y)(frac{10}{11} -y)$

7) $z^{2} -frac{169}{196} =(z+frac{13}{14} )(z-frac{13}{14})$

8) $z^{2} -frac{400}{441} =(z+frac{20}{21} )(z-frac{20}{21} )$

9) 25x²-36=(5x+6)(5x-6)

10) -16+49y²=49y²-16=(7y+4)(7y-4)

11) $0,64-frac{1}{9}z^{2} =(0,8+frac{1}{3}z)(0,8-frac{1}{3}z)$

12) $frac{4}{25}t^{2} -36=(frac{2}{5}t+6) (frac{2}{5}t-6)$