1)(9a-7x-y)(9a+7x+y)
2)1-(3x+y)²=(1-3x-y)(1+3x+y)
3)4n(x-2)-3(x-2)=(x-2)(4n-3)
4)x²(8a-7b)(8a+7b)
5)8a(a-x)-5(a-x)=(a-x)(8a-5)
1)x²(x+5)-10(x+5)=0
(x+5)(x²-10)=0
x+5=0⇒x=-5
x²-10=0⇒x²=10⇒x=+-√10
2)(5-2x)(7x-1)-(5-2x)²=0
(5-2x)(7x-1-5+2x)=0
(5-2x)(9x-6)=0
5-2x=0⇒2x=5⇒x=2,5
9x-6=0⇒9x=6⇒x=2/3