Объяснение:
1(с-8)(с+8)=с²-8²=с²- 64
2.(5х-7у²)(5х+7у²)=(5х)²-(7у)²= 25х² -49у²
3.(а⁴+ b³)(b³-a⁴)=(b³+a⁴)(b³-a⁴)=(b³)²-(a⁴)²= b⁶ - a ⁸
4.(-9xy-z)(9xy-z)=-(9xy+z)(9xy-z)=-((9xy)²-(z)²)= - 81x²y² +z²= z² - 81 x²y²
Объяснение:
1(с-8)(с+8)=с²-8²=с²- 64
2.(5х-7у²)(5х+7у²)=(5х)²-(7у)²= 25х² -49у²
3.(а⁴+ b³)(b³-a⁴)=(b³+a⁴)(b³-a⁴)=(b³)²-(a⁴)²= b⁶ - a ⁸
4.(-9xy-z)(9xy-z)=-(9xy+z)(9xy-z)=-((9xy)²-(z)²)= - 81x²y² +z²= z² - 81 x²y²