Question

Разложите на множители
-9а^2 + 4в^2
-0.09х^2у^2 + 1

Answer 1

-9а² + 4b²= 4b²-9а² =(2b+3a)(2b-3a)
-0.09х²у² + 1=1-0.09х²у² =(1-0.3xy)(1+0.3xy)